Loans Loans - Weighted Average Risk Grade for All Commercial Loans by Class and Year of Origination (Details) $ in Thousands	Mar. 31, 2023 USD ($) Grade	Dec. 31, 2022 USD ($) Grade
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 17,486,020	$ 17,154,969
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	828,110
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,039,545
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	624,808
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	448,505
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	220,055
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	300,049
Financing Receivable, Revolving	2,133,845
Loans and Leases Receivable, Net of Deferred Income	$ 5,668,697	$ 5,674,798
Weighted Average Risk Grade For Loans | Grade	6.39	6.39
Commercial and Industrial Total Energy Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 325,616
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	88,754
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	94,011
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	4,887
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	8,100
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	9,311
Financing Receivable, Revolving	491,780
Loans and Leases Receivable, Net of Deferred Income	$ 1,066,388	$ 925,729
Weighted Average Risk Grade For Loans | Grade	5.99	5.67
Commercial Real Estate Buildings Land And Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 447,974
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,766,241
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,482,017
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	968,630
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	676,887
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,186,720
Financing Receivable, Revolving	154,539
Loans and Leases Receivable, Net of Deferred Income	$ 6,789,838	$ 6,706,078
Weighted Average Risk Grade For Loans | Grade	7.11	7.09
Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 214,583
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	553,934
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	427,754
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	101,526
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	961
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,970
Financing Receivable, Revolving	180,876
Loans and Leases Receivable, Net of Deferred Income	$ 1,482,458	$ 1,477,247
Weighted Average Risk Grade For Loans | Grade	7.39	7.12
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 662,557
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,320,175
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,909,771
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,070,156
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	677,848
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,188,690
Financing Receivable, Revolving	335,415
Loans and Leases Receivable, Net of Deferred Income	$ 8,272,296	$ 8,183,325
Weighted Average Risk Grade For Loans | Grade	7.16	7.10
Risk Grade One To Eight [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 824,021
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,023,049
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	584,919
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	438,100
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	206,973
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	284,568
Financing Receivable, Revolving	2,033,889
Loans and Leases Receivable, Net of Deferred Income	$ 5,445,083	$ 5,435,917
Weighted Average Risk Grade For Loans | Grade	6.25	6.24
Risk Grade One To Eight [Member] | Commercial and Industrial Total Energy Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 317,804
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	79,796
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	92,367
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	4,588
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,734
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	8,395
Financing Receivable, Revolving	454,453
Loans and Leases Receivable, Net of Deferred Income	$ 1,001,614	$ 887,182
Weighted Average Risk Grade For Loans | Grade	5.71	5.44
Risk Grade One To Eight [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 437,014
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,677,855
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,437,065
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	919,210
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	612,177
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,094,299
Financing Receivable, Revolving	149,384
Loans and Leases Receivable, Net of Deferred Income	$ 6,431,213	$ 6,340,028
Weighted Average Risk Grade For Loans | Grade	6.96	6.94
Risk Grade One To Eight [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 209,154
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	524,611
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	389,715
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	76,004
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	961
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,970
Financing Receivable, Revolving	165,201
Loans and Leases Receivable, Net of Deferred Income	$ 1,368,470	$ 1,430,012
Weighted Average Risk Grade For Loans | Grade	7.18	7.04
Risk Grade One To Eight [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income		$ 7,770,040
Weighted Average Risk Grade For Loans | Grade		6.96
Risk Grade Nine [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 3,907
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	12,818
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	33,802
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	3,483
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,206
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	11,015
Financing Receivable, Revolving	65,547
Loans and Leases Receivable, Net of Deferred Income	$ 139,716	$ 146,192
Weighted Average Risk Grade For Loans | Grade	9.00	9.00
Risk Grade Nine [Member] | Commercial and Industrial Total Energy Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	4,797
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,513
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	85
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	501
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	664
Financing Receivable, Revolving	30,108
Loans and Leases Receivable, Net of Deferred Income	$ 37,694	$ 11,112
Weighted Average Risk Grade For Loans | Grade	9.00	9.00
Risk Grade Nine [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 386
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	54,811
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	27,557
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	18,737
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	50,933
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	30,140
Financing Receivable, Revolving	2,162
Loans and Leases Receivable, Net of Deferred Income	$ 186,904	$ 189,928
Weighted Average Risk Grade For Loans | Grade	9.00	9.00
Risk Grade Nine [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 4,511
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	13,834
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	25,522
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Revolving	15,675
Loans and Leases Receivable, Net of Deferred Income	$ 59,542	$ 34,952
Weighted Average Risk Grade For Loans | Grade	9.00	9.00
Risk Grade Nine [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income		$ 224,880
Weighted Average Risk Grade For Loans | Grade		9.00
Risk Grade Ten [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,253
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	666
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	446
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	4,305
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,081
Financing Receivable, Revolving	12,520
Loans and Leases Receivable, Net of Deferred Income	$ 21,123	$ 37,596
Weighted Average Risk Grade For Loans | Grade	10.00	10.00
Risk Grade Ten [Member] | Commercial and Industrial Total Energy Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	388
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	201
Financing Receivable, Revolving	0
Loans and Leases Receivable, Net of Deferred Income	$ 1,309	$ 642
Weighted Average Risk Grade For Loans | Grade	10.00	10.00
Risk Grade Ten [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	23,228
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	6,122
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	3,683
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	8,888
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	7,257
Financing Receivable, Revolving	0
Loans and Leases Receivable, Net of Deferred Income	$ 49,178	$ 91,020
Weighted Average Risk Grade For Loans | Grade	10.00	10.00
Risk Grade Ten [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 918
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	68
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Revolving	0
Loans and Leases Receivable, Net of Deferred Income	$ 986	$ 931
Weighted Average Risk Grade For Loans | Grade	10.00	10.00
Risk Grade Ten [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income		$ 91,951
Weighted Average Risk Grade For Loans | Grade		10.00
Risk Grade Eleven [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 182
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,286
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	4,395
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	5,661
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,450
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,138
Financing Receivable, Revolving	21,199
Loans and Leases Receivable, Net of Deferred Income	$ 52,281	$ 36,963
Weighted Average Risk Grade For Loans | Grade	11.00	11.00
Risk Grade Eleven [Member] | Commercial and Industrial Total Energy Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	131
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	142
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,106
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	43
Financing Receivable, Revolving	0
Loans and Leases Receivable, Net of Deferred Income	$ 3,422	$ 11,569
Weighted Average Risk Grade For Loans | Grade	11.00	11.00
Risk Grade Eleven [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 10,574
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	7,804
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	10,970
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	27,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	4,678
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	53,477
Financing Receivable, Revolving	2,993
Loans and Leases Receivable, Net of Deferred Income	$ 117,939	$ 81,550
Weighted Average Risk Grade For Loans | Grade	11.00	11.00
Risk Grade Eleven [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	15,489
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	37,971
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Revolving	0
Loans and Leases Receivable, Net of Deferred Income	$ 53,460	$ 11,352
Weighted Average Risk Grade For Loans | Grade	11.00	11.00
Risk Grade Eleven [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income		$ 92,902
Weighted Average Risk Grade For Loans | Grade		11.00
Risk Grade Twelve [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	139
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	826
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	763
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,851
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,247
Financing Receivable, Revolving	242
Loans and Leases Receivable, Net of Deferred Income	$ 7,283	$ 12,521
Weighted Average Risk Grade For Loans | Grade	12.00	12.00
Risk Grade Twelve [Member] | Commercial and Industrial Total Energy Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 7,812
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,499
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	72
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,371
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	8
Financing Receivable, Revolving	4,248
Loans and Leases Receivable, Net of Deferred Income	$ 17,536	$ 10,840
Weighted Average Risk Grade For Loans | Grade	12.00	12.00
Risk Grade Twelve [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,417
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	303
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	211
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,547
Financing Receivable, Revolving	0
Loans and Leases Receivable, Net of Deferred Income	$ 4,478	$ 2,957
Weighted Average Risk Grade For Loans | Grade	12.00	12.00
Risk Grade Twelve [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Revolving	0
Loans and Leases Receivable, Net of Deferred Income	$ 0	$ 0
Weighted Average Risk Grade For Loans | Grade	12.00	12.00
Risk Grade Twelve [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income		$ 2,957
Weighted Average Risk Grade For Loans | Grade		12.00
Risk Grade Thirteen [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	200
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	52
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	270
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Revolving	448
Loans and Leases Receivable, Net of Deferred Income	$ 3,211	$ 5,609
Weighted Average Risk Grade For Loans | Grade	13.00	13.00
Risk Grade Thirteen [Member] | Commercial and Industrial Total Energy Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	662
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Revolving	2,971
Loans and Leases Receivable, Net of Deferred Income	$ 4,813	$ 4,384
Weighted Average Risk Grade For Loans | Grade	13.00	13.00
Risk Grade Thirteen [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	126
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Revolving	0
Loans and Leases Receivable, Net of Deferred Income	$ 126	$ 595
Weighted Average Risk Grade For Loans | Grade	13.00	13.00
Risk Grade Thirteen [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Revolving	0
Loans and Leases Receivable, Net of Deferred Income	$ 0	$ 0
Weighted Average Risk Grade For Loans | Grade	13.00	13.00
Risk Grade Thirteen [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income		$ 595
Weighted Average Risk Grade For Loans | Grade		13.00
Revolving Credit Facility [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	6.22
Revolving Credit Facility [Member] | Commercial and Industrial Total Energy Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	5.65
Revolving Credit Facility [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	7.14
Revolving Credit Facility [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	7.52
Revolving Credit Facility [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	7.34
Revolving Loans Converted to Term [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	$ 73,780
Weighted Average Risk Grade For Loans | Grade	7.91
Revolving Loans Converted to Term [Member] | Commercial and Industrial Total Energy Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	$ 43,929
Weighted Average Risk Grade For Loans | Grade	5.98
Revolving Loans Converted to Term [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	$ 106,830
Weighted Average Risk Grade For Loans | Grade	6.46
Revolving Loans Converted to Term [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	$ 854
Weighted Average Risk Grade For Loans | Grade	5.86
Revolving Loans Converted to Term [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	$ 107,684
Weighted Average Risk Grade For Loans | Grade	6.46
Revolving Loans Converted to Term [Member] | Risk Grade One To Eight [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	$ 49,564
Revolving Loans Converted to Term [Member] | Risk Grade One To Eight [Member] | Commercial and Industrial Total Energy Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	41,477
Revolving Loans Converted to Term [Member] | Risk Grade One To Eight [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	104,209
Revolving Loans Converted to Term [Member] | Risk Grade One To Eight [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	854
Revolving Loans Converted to Term [Member] | Risk Grade Nine [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	5,938
Revolving Loans Converted to Term [Member] | Risk Grade Nine [Member] | Commercial and Industrial Total Energy Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	26
Revolving Loans Converted to Term [Member] | Risk Grade Nine [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	2,178
Revolving Loans Converted to Term [Member] | Risk Grade Nine [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Revolving Loans Converted to Term [Member] | Risk Grade Ten [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	852
Revolving Loans Converted to Term [Member] | Risk Grade Ten [Member] | Commercial and Industrial Total Energy Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	720
Revolving Loans Converted to Term [Member] | Risk Grade Ten [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Revolving Loans Converted to Term [Member] | Risk Grade Ten [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Revolving Loans Converted to Term [Member] | Risk Grade Eleven [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	13,970
Revolving Loans Converted to Term [Member] | Risk Grade Eleven [Member] | Commercial and Industrial Total Energy Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Revolving Loans Converted to Term [Member] | Risk Grade Eleven [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	443
Revolving Loans Converted to Term [Member] | Risk Grade Eleven [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Revolving Loans Converted to Term [Member] | Risk Grade Twelve [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	1,215
Revolving Loans Converted to Term [Member] | Risk Grade Twelve [Member] | Commercial and Industrial Total Energy Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	526
Revolving Loans Converted to Term [Member] | Risk Grade Twelve [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Revolving Loans Converted to Term [Member] | Risk Grade Twelve [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Revolving Loans Converted to Term [Member] | Risk Grade Thirteen [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	2,241
Revolving Loans Converted to Term [Member] | Risk Grade Thirteen [Member] | Commercial and Industrial Total Energy Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	1,180
Revolving Loans Converted to Term [Member] | Risk Grade Thirteen [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Revolving Loans Converted to Term [Member] | Risk Grade Thirteen [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	$ 0
2023 [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	6.13
2023 [Member] | Commercial and Industrial Total Energy Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	6.14
2023 [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	7.15
2023 [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	7.50
2023 [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	7.26
2022 [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	6.67
2022 [Member] | Commercial and Industrial Total Energy Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	7.13
2022 [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	7.07
2022 [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	7.30
2022 [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	7.12
2021 [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	7.10
2021 [Member] | Commercial and Industrial Total Energy Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	5.66
2021 [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	7.21
2021 [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	7.61
2021 [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	7.30
2020 [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	5.94
2020 [Member] | Commercial and Industrial Total Energy Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	7.65
2020 [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	7.18
2020 [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	6.49
2020 [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	7.12
2019 [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	6.46
2019 [Member] | Commercial and Industrial Total Energy Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	9.73
2019 [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	7.04
2019 [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	7.07
2019 [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	7.04
Prior Years [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	6.05
Prior Years [Member] | Commercial and Industrial Total Energy Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	6.85
Prior Years [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	7.06
Prior Years [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	6.66
Prior Years [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade For Loans | Grade	7.06