Loans, Credit Quality Indicator by Vintage Year (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	$ 24,365,633
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3,644,110
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,391,098
Financing Receivable, Originated Three Years before Latest Fiscal Year	3,056,543
Financing Receivable, Originated Two Years before Latest Fiscal Year	4,139,743
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	6,073,368
Financing Receivable, Originated in Current Fiscal Year	1,682,992
Financing Receivable, Revolving	3,377,780
Financing Receivable, Revolving, Converted To Term Loan	8,145
Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	220,093
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	7,927
Financing Receivable, Originated Four Years before Latest Fiscal Year	39,741
Financing Receivable, Originated Three Years before Latest Fiscal Year	16,710
Financing Receivable, Originated Two Years before Latest Fiscal Year	53,857
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	67,642
Financing Receivable, Originated in Current Fiscal Year	5,635
Financing Receivable, Revolving	28,581
Financing Receivable, Revolving, Converted To Term Loan	106
Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	23,774,932
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3,557,616
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,288,760
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,955,768
Financing Receivable, Originated Two Years before Latest Fiscal Year	4,053,928
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	5,959,806
Financing Receivable, Originated in Current Fiscal Year	1,675,554
Financing Receivable, Revolving	3,283,501
Financing Receivable, Revolving, Converted To Term Loan	7,125
Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	233,892
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	18,729
Financing Receivable, Originated Four Years before Latest Fiscal Year	32,207
Financing Receivable, Originated Three Years before Latest Fiscal Year	58,210
Financing Receivable, Originated Two Years before Latest Fiscal Year	25,615
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	34,660
Financing Receivable, Originated in Current Fiscal Year	255
Financing Receivable, Revolving	64,216
Financing Receivable, Revolving, Converted To Term Loan	685
Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	136,717
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	59,838
Financing Receivable, Originated Four Years before Latest Fiscal Year	30,390
Financing Receivable, Originated Three Years before Latest Fiscal Year	25,856
Financing Receivable, Originated Two Years before Latest Fiscal Year	6,343
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	11,260
Financing Receivable, Originated in Current Fiscal Year	1,549
Financing Receivable, Revolving	1,482
Financing Receivable, Revolving, Converted To Term Loan	229
Oil and Gas Portfolio Segment [Member] | Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	67,000
Oil and Gas Portfolio Segment [Member] | Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	29,000
Total commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	15,041,555
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,161,333
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,051,317
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,565,762
Financing Receivable, Originated Two Years before Latest Fiscal Year	3,251,035
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	4,235,777
Financing Receivable, Originated in Current Fiscal Year	1,326,976
Financing Receivable, Revolving	2,449,354
Financing Receivable, Revolving, Converted To Term Loan	1,462
Total commercial | Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	216,843
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	7,013
Financing Receivable, Originated Four Years before Latest Fiscal Year	39,530
Financing Receivable, Originated Three Years before Latest Fiscal Year	16,638
Financing Receivable, Originated Two Years before Latest Fiscal Year	53,729
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	67,603
Financing Receivable, Originated in Current Fiscal Year	5,570
Financing Receivable, Revolving	26,760
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	14,534,111
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,117,872
Financing Receivable, Originated Four Years before Latest Fiscal Year	962,480
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,475,393
Financing Receivable, Originated Two Years before Latest Fiscal Year	3,171,136
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	4,126,902
Financing Receivable, Originated in Current Fiscal Year	1,320,350
Financing Receivable, Revolving	2,359,976
Financing Receivable, Revolving, Converted To Term Loan	777
Total commercial | Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	228,333
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	17,309
Financing Receivable, Originated Four Years before Latest Fiscal Year	31,775
Financing Receivable, Originated Three Years before Latest Fiscal Year	57,217
Financing Receivable, Originated Two Years before Latest Fiscal Year	25,532
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	34,073
Financing Receivable, Originated in Current Fiscal Year	255
Financing Receivable, Revolving	62,171
Financing Receivable, Revolving, Converted To Term Loan	685
Total commercial | Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	62,269
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	19,138
Financing Receivable, Originated Four Years before Latest Fiscal Year	17,532
Financing Receivable, Originated Three Years before Latest Fiscal Year	16,514
Financing Receivable, Originated Two Years before Latest Fiscal Year	637
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	7,200
Financing Receivable, Originated in Current Fiscal Year	801
Financing Receivable, Revolving	446
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Commercial And Industrial Financing Receivable [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	8,517,974
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	617,827
Financing Receivable, Originated Four Years before Latest Fiscal Year	426,869
Financing Receivable, Originated Three Years before Latest Fiscal Year	917,402
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,797,672
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,971,173
Financing Receivable, Originated in Current Fiscal Year	671,779
Financing Receivable, Revolving	2,115,253
Financing Receivable, Revolving, Converted To Term Loan	1,462
Total commercial | Commercial And Industrial Financing Receivable [Member] | Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	63,922
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	151
Financing Receivable, Originated Four Years before Latest Fiscal Year	7,287
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,260
Financing Receivable, Originated Two Years before Latest Fiscal Year	5,255
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	17,726
Financing Receivable, Originated in Current Fiscal Year	5,570
Financing Receivable, Revolving	26,674
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Commercial And Industrial Financing Receivable [Member] | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	8,245,450
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	598,104
Financing Receivable, Originated Four Years before Latest Fiscal Year	392,996
Financing Receivable, Originated Three Years before Latest Fiscal Year	846,057
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,770,838
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,943,817
Financing Receivable, Originated in Current Fiscal Year	665,843
Financing Receivable, Revolving	2,027,795
Financing Receivable, Revolving, Converted To Term Loan	777
Total commercial | Commercial And Industrial Financing Receivable [Member] | Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	149,747
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,401
Financing Receivable, Originated Four Years before Latest Fiscal Year	9,053
Financing Receivable, Originated Three Years before Latest Fiscal Year	53,915
Financing Receivable, Originated Two Years before Latest Fiscal Year	21,030
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,430
Financing Receivable, Originated in Current Fiscal Year	134
Financing Receivable, Revolving	60,784
Financing Receivable, Revolving, Converted To Term Loan	685
Total commercial | Commercial And Industrial Financing Receivable [Member] | Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	58,854
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	17,171
Financing Receivable, Originated Four Years before Latest Fiscal Year	17,532
Financing Receivable, Originated Three Years before Latest Fiscal Year	16,171
Financing Receivable, Originated Two Years before Latest Fiscal Year	550
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	7,200
Financing Receivable, Originated in Current Fiscal Year	231
Financing Receivable, Revolving	0
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Commercial real estate — owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	940,687
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	159,043
Financing Receivable, Originated Four Years before Latest Fiscal Year	171,026
Financing Receivable, Originated Three Years before Latest Fiscal Year	135,576
Financing Receivable, Originated Two Years before Latest Fiscal Year	158,056
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	238,039
Financing Receivable, Originated in Current Fiscal Year	33,207
Financing Receivable, Revolving	45,739
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Commercial real estate — owner occupied | Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	37,789
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	5,321
Financing Receivable, Originated Four Years before Latest Fiscal Year	662
Financing Receivable, Originated Three Years before Latest Fiscal Year	139
Financing Receivable, Originated Two Years before Latest Fiscal Year	15,143
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	16,438
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Revolving	86
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Commercial real estate — owner occupied | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	885,257
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	150,188
Financing Receivable, Originated Four Years before Latest Fiscal Year	160,435
Financing Receivable, Originated Three Years before Latest Fiscal Year	133,631
Financing Receivable, Originated Two Years before Latest Fiscal Year	141,652
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	220,821
Financing Receivable, Originated in Current Fiscal Year	33,107
Financing Receivable, Revolving	45,423
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Commercial real estate — owner occupied | Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	15,802
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,126
Financing Receivable, Originated Four Years before Latest Fiscal Year	9,930
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,463
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,173
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	780
Financing Receivable, Originated in Current Fiscal Year	100
Financing Receivable, Revolving	230
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Commercial real estate — owner occupied | Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	1,838
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,407
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	343
Financing Receivable, Originated Two Years before Latest Fiscal Year	88
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Commercial and business lending
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	9,458,661
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	776,869
Financing Receivable, Originated Four Years before Latest Fiscal Year	597,895
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,052,978
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,955,729
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,209,212
Financing Receivable, Originated in Current Fiscal Year	704,986
Financing Receivable, Revolving	2,160,992
Financing Receivable, Revolving, Converted To Term Loan	1,462
Total commercial | Commercial and business lending | Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	101,711
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	5,472
Financing Receivable, Originated Four Years before Latest Fiscal Year	7,949
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,399
Financing Receivable, Originated Two Years before Latest Fiscal Year	20,398
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	34,163
Financing Receivable, Originated in Current Fiscal Year	5,570
Financing Receivable, Revolving	26,760
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Commercial and business lending | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	9,130,708
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	748,292
Financing Receivable, Originated Four Years before Latest Fiscal Year	553,431
Financing Receivable, Originated Three Years before Latest Fiscal Year	979,688
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,912,490
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,164,638
Financing Receivable, Originated in Current Fiscal Year	698,951
Financing Receivable, Revolving	2,073,218
Financing Receivable, Revolving, Converted To Term Loan	777
Total commercial | Commercial and business lending | Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	165,550
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	4,527
Financing Receivable, Originated Four Years before Latest Fiscal Year	18,983
Financing Receivable, Originated Three Years before Latest Fiscal Year	55,378
Financing Receivable, Originated Two Years before Latest Fiscal Year	22,204
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,211
Financing Receivable, Originated in Current Fiscal Year	234
Financing Receivable, Revolving	61,014
Financing Receivable, Revolving, Converted To Term Loan	685
Total commercial | Commercial and business lending | Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	60,692
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	18,578
Financing Receivable, Originated Four Years before Latest Fiscal Year	17,532
Financing Receivable, Originated Three Years before Latest Fiscal Year	16,514
Financing Receivable, Originated Two Years before Latest Fiscal Year	637
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	7,200
Financing Receivable, Originated in Current Fiscal Year	231
Financing Receivable, Revolving	0
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Commercial real estate — investor
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	4,038,036
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	358,524
Financing Receivable, Originated Four Years before Latest Fiscal Year	450,091
Financing Receivable, Originated Three Years before Latest Fiscal Year	364,261
Financing Receivable, Originated Two Years before Latest Fiscal Year	839,004
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,317,691
Financing Receivable, Originated in Current Fiscal Year	500,221
Financing Receivable, Revolving	208,244
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Commercial real estate — investor | Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	96,913
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,525
Financing Receivable, Originated Four Years before Latest Fiscal Year	31,581
Financing Receivable, Originated Three Years before Latest Fiscal Year	15,239
Financing Receivable, Originated Two Years before Latest Fiscal Year	15,128
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	33,440
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Commercial real estate — investor | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	3,879,003
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	344,191
Financing Receivable, Originated Four Years before Latest Fiscal Year	405,718
Financing Receivable, Originated Three Years before Latest Fiscal Year	348,738
Financing Receivable, Originated Two Years before Latest Fiscal Year	820,547
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,253,538
Financing Receivable, Originated in Current Fiscal Year	499,631
Financing Receivable, Revolving	206,640
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Commercial real estate — investor | Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	61,030
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	12,734
Financing Receivable, Originated Four Years before Latest Fiscal Year	12,792
Financing Receivable, Originated Three Years before Latest Fiscal Year	283
Financing Receivable, Originated Two Years before Latest Fiscal Year	3,329
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	30,714
Financing Receivable, Originated in Current Fiscal Year	20
Financing Receivable, Revolving	1,157
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Commercial real estate — investor | Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	1,091
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	75
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated in Current Fiscal Year	570
Financing Receivable, Revolving	446
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Real Estate Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	1,544,858
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	25,939
Financing Receivable, Originated Four Years before Latest Fiscal Year	3,331
Financing Receivable, Originated Three Years before Latest Fiscal Year	148,523
Financing Receivable, Originated Two Years before Latest Fiscal Year	456,303
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	708,875
Financing Receivable, Originated in Current Fiscal Year	121,768
Financing Receivable, Revolving	80,118
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Real Estate Construction | Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	18,219
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	16
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	18,203
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Real Estate Construction | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	1,524,400
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	25,389
Financing Receivable, Originated Four Years before Latest Fiscal Year	3,331
Financing Receivable, Originated Three Years before Latest Fiscal Year	146,967
Financing Receivable, Originated Two Years before Latest Fiscal Year	438,100
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	708,726
Financing Receivable, Originated in Current Fiscal Year	121,768
Financing Receivable, Revolving	80,118
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Real Estate Construction | Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	1,753
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	48
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,557
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	148
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Real Estate Construction | Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	486
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	486
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	5,582,894
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	384,463
Financing Receivable, Originated Four Years before Latest Fiscal Year	453,422
Financing Receivable, Originated Three Years before Latest Fiscal Year	512,784
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,295,307
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,026,565
Financing Receivable, Originated in Current Fiscal Year	621,990
Financing Receivable, Revolving	288,362
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Commercial Real Estate | Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	115,132
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,540
Financing Receivable, Originated Four Years before Latest Fiscal Year	31,581
Financing Receivable, Originated Three Years before Latest Fiscal Year	15,239
Financing Receivable, Originated Two Years before Latest Fiscal Year	33,331
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	33,440
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Commercial Real Estate | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	5,403,403
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	369,580
Financing Receivable, Originated Four Years before Latest Fiscal Year	409,049
Financing Receivable, Originated Three Years before Latest Fiscal Year	495,705
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,258,647
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,962,264
Financing Receivable, Originated in Current Fiscal Year	621,399
Financing Receivable, Revolving	286,759
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Commercial Real Estate | Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	62,783
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	12,782
Financing Receivable, Originated Four Years before Latest Fiscal Year	12,792
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,840
Financing Receivable, Originated Two Years before Latest Fiscal Year	3,329
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	30,862
Financing Receivable, Originated in Current Fiscal Year	20
Financing Receivable, Revolving	1,157
Financing Receivable, Revolving, Converted To Term Loan	0
Total commercial | Commercial Real Estate | Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	1,577
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	560
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated in Current Fiscal Year	570
Financing Receivable, Revolving	446
Financing Receivable, Revolving, Converted To Term Loan	0
Total consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	9,324,079
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,482,777
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,339,780
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,490,781
Financing Receivable, Originated Two Years before Latest Fiscal Year	888,708
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,837,590
Financing Receivable, Originated in Current Fiscal Year	356,017
Financing Receivable, Revolving	928,426
Financing Receivable, Revolving, Converted To Term Loan	6,683
Total consumer | Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	3,251
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	914
Financing Receivable, Originated Four Years before Latest Fiscal Year	212
Financing Receivable, Originated Three Years before Latest Fiscal Year	71
Financing Receivable, Originated Two Years before Latest Fiscal Year	128
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	40
Financing Receivable, Originated in Current Fiscal Year	65
Financing Receivable, Revolving	1,821
Financing Receivable, Revolving, Converted To Term Loan	106
Total consumer | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	9,240,821
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,439,744
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,326,279
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,480,375
Financing Receivable, Originated Two Years before Latest Fiscal Year	882,791
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,832,904
Financing Receivable, Originated in Current Fiscal Year	355,204
Financing Receivable, Revolving	923,525
Financing Receivable, Revolving, Converted To Term Loan	6,348
Total consumer | Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	5,559
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,420
Financing Receivable, Originated Four Years before Latest Fiscal Year	432
Financing Receivable, Originated Three Years before Latest Fiscal Year	992
Financing Receivable, Originated Two Years before Latest Fiscal Year	83
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	587
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Revolving	2,045
Financing Receivable, Revolving, Converted To Term Loan	0
Total consumer | Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	74,448
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	40,700
Financing Receivable, Originated Four Years before Latest Fiscal Year	12,857
Financing Receivable, Originated Three Years before Latest Fiscal Year	9,342
Financing Receivable, Originated Two Years before Latest Fiscal Year	5,706
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	4,060
Financing Receivable, Originated in Current Fiscal Year	748
Financing Receivable, Revolving	1,036
Financing Receivable, Revolving, Converted To Term Loan	229
Total consumer | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	8,132,417
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,261,335
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,334,308
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,484,752
Financing Receivable, Originated Two Years before Latest Fiscal Year	879,575
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,819,630
Financing Receivable, Originated in Current Fiscal Year	352,726
Financing Receivable, Revolving	92
Financing Receivable, Revolving, Converted To Term Loan	0
Total consumer | Residential mortgage | Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	667
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	572
Financing Receivable, Originated Four Years before Latest Fiscal Year	36
Financing Receivable, Originated Three Years before Latest Fiscal Year	22
Financing Receivable, Originated Two Years before Latest Fiscal Year	37
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, Revolving, Converted To Term Loan	0
Total consumer | Residential mortgage | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	8,063,574
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,226,104
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,321,163
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,474,788
Financing Receivable, Originated Two Years before Latest Fiscal Year	874,080
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,815,240
Financing Receivable, Originated in Current Fiscal Year	352,107
Financing Receivable, Revolving	92
Financing Receivable, Revolving, Converted To Term Loan	0
Total consumer | Residential mortgage | Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	3,322
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,274
Financing Receivable, Originated Four Years before Latest Fiscal Year	432
Financing Receivable, Originated Three Years before Latest Fiscal Year	992
Financing Receivable, Originated Two Years before Latest Fiscal Year	36
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	587
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, Revolving, Converted To Term Loan	0
Total consumer | Residential mortgage | Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	64,855
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	33,385
Financing Receivable, Originated Four Years before Latest Fiscal Year	12,678
Financing Receivable, Originated Three Years before Latest Fiscal Year	8,949
Financing Receivable, Originated Two Years before Latest Fiscal Year	5,422
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,802
Financing Receivable, Originated in Current Fiscal Year	619
Financing Receivable, Revolving	0
Financing Receivable, Revolving, Converted To Term Loan	0
Total consumer | Home Equity Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	844,901
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	91,314
Financing Receivable, Originated Four Years before Latest Fiscal Year	3,025
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,807
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,290
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,888
Financing Receivable, Originated in Current Fiscal Year	417
Financing Receivable, Revolving	743,161
Financing Receivable, Revolving, Converted To Term Loan	6,609
Total consumer | Home Equity Loan | Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	1,942
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	338
Financing Receivable, Originated Four Years before Latest Fiscal Year	97
Financing Receivable, Originated Three Years before Latest Fiscal Year	50
Financing Receivable, Originated Two Years before Latest Fiscal Year	91
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	39
Financing Receivable, Originated in Current Fiscal Year	65
Financing Receivable, Revolving	1,262
Financing Receivable, Revolving, Converted To Term Loan	102
Total consumer | Home Equity Loan | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	831,344
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	83,567
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,748
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,374
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,869
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,626
Financing Receivable, Originated in Current Fiscal Year	223
Financing Receivable, Revolving	738,938
Financing Receivable, Revolving, Converted To Term Loan	6,286
Total consumer | Home Equity Loan | Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	2,238
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	146
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	46
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Revolving	2,045
Financing Receivable, Revolving, Converted To Term Loan	0
Total consumer | Home Equity Loan | Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	9,378
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	7,263
Financing Receivable, Originated Four Years before Latest Fiscal Year	180
Financing Receivable, Originated Three Years before Latest Fiscal Year	383
Financing Receivable, Originated Two Years before Latest Fiscal Year	284
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	224
Financing Receivable, Originated in Current Fiscal Year	128
Financing Receivable, Revolving	916
Financing Receivable, Revolving, Converted To Term Loan	221
Total consumer | Other consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	346,761
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	130,129
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,447
Financing Receivable, Originated Three Years before Latest Fiscal Year	3,223
Financing Receivable, Originated Two Years before Latest Fiscal Year	6,843
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	16,072
Financing Receivable, Originated in Current Fiscal Year	2,874
Financing Receivable, Revolving	185,173
Financing Receivable, Revolving, Converted To Term Loan	75
Total consumer | Other consumer | Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	642
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	4
Financing Receivable, Originated Four Years before Latest Fiscal Year	78
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Revolving	559
Financing Receivable, Revolving, Converted To Term Loan	4
Total consumer | Other consumer | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	345,904
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	130,073
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,369
Financing Receivable, Originated Three Years before Latest Fiscal Year	3,213
Financing Receivable, Originated Two Years before Latest Fiscal Year	6,843
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	16,037
Financing Receivable, Originated in Current Fiscal Year	2,874
Financing Receivable, Revolving	184,495
Financing Receivable, Revolving, Converted To Term Loan	62
Total consumer | Other consumer | Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, Revolving, Converted To Term Loan	0
Total consumer | Other consumer | Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	215
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	52
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	10
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	34
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Revolving	119
Financing Receivable, Revolving, Converted To Term Loan	$ 8