Loans, Allowance for Credit Losses and Credit Quality Finance Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	$ 1,711,032
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,267,076
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,131,429
Financing Receivable, Originated Four Years before Latest Fiscal Year	879,559
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,749,590
Financing Receivable, Revolving	1,674,656
Financing Receivable, after Allowance for Credit Loss	497,485
Loans and Leases Receivable, Gross	8,916,430	$ 8,873,639
Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	955,120
Financing Receivable, Originated Two Years before Latest Fiscal Year	627,312
Financing Receivable, Originated Three Years before Latest Fiscal Year	680,236
Financing Receivable, Originated Four Years before Latest Fiscal Year	485,668
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	999,942
Financing Receivable, Revolving	48,056
Financing Receivable, after Allowance for Credit Loss	262,026
Loans and Leases Receivable, Gross	4,061,347	4,002,359
Commercial Real Estate [Member] | Potential Weakness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	8,303
Financing Receivable, Originated Two Years before Latest Fiscal Year	33,755
Financing Receivable, Originated Three Years before Latest Fiscal Year	8,506
Financing Receivable, Originated Four Years before Latest Fiscal Year	9,851
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	42,382
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	1,809
Loans and Leases Receivable, Gross	104,606
Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	943,205
Financing Receivable, Originated Two Years before Latest Fiscal Year	586,125
Financing Receivable, Originated Three Years before Latest Fiscal Year	651,335
Financing Receivable, Originated Four Years before Latest Fiscal Year	468,824
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	945,248
Financing Receivable, Revolving	48,056
Financing Receivable, after Allowance for Credit Loss	260,217
Loans and Leases Receivable, Gross	3,905,997
Commercial Real Estate [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,612
Financing Receivable, Originated Two Years before Latest Fiscal Year	7,432
Financing Receivable, Originated Three Years before Latest Fiscal Year	20,395
Financing Receivable, Originated Four Years before Latest Fiscal Year	6,993
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	12,312
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	50,744
Commercial Real Estate [Member] | Partial Loss Probable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	0
Commercial Real Estate [Member] | Definite Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	0
Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	221,485
Financing Receivable, Originated Two Years before Latest Fiscal Year	165,871
Financing Receivable, Originated Three Years before Latest Fiscal Year	60,821
Financing Receivable, Originated Four Years before Latest Fiscal Year	40,014
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	35,897
Financing Receivable, Revolving	803,016
Financing Receivable, after Allowance for Credit Loss	120,743
Loans and Leases Receivable, Gross	1,448,224	1,395,036
Commercial And Industrial [Member] | Potential Weakness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	5,432
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,489
Financing Receivable, Originated Three Years before Latest Fiscal Year	4,909
Financing Receivable, Originated Four Years before Latest Fiscal Year	725
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	697
Financing Receivable, Revolving	21,780
Financing Receivable, after Allowance for Credit Loss	362
Loans and Leases Receivable, Gross	35,444
Commercial And Industrial [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	213,925
Financing Receivable, Originated Two Years before Latest Fiscal Year	138,376
Financing Receivable, Originated Three Years before Latest Fiscal Year	50,323
Financing Receivable, Originated Four Years before Latest Fiscal Year	36,685
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	33,576
Financing Receivable, Revolving	736,304
Financing Receivable, after Allowance for Credit Loss	119,886
Loans and Leases Receivable, Gross	1,329,402
Commercial And Industrial [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,128
Financing Receivable, Originated Two Years before Latest Fiscal Year	26,006
Financing Receivable, Originated Three Years before Latest Fiscal Year	5,589
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,604
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,575
Financing Receivable, Revolving	44,932
Financing Receivable, after Allowance for Credit Loss	495
Loans and Leases Receivable, Gross	83,329
Commercial And Industrial [Member] | Partial Loss Probable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	49
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	49
Commercial And Industrial [Member] | Definite Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	0
Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	222,327
Financing Receivable, Originated Two Years before Latest Fiscal Year	116,795
Financing Receivable, Originated Three Years before Latest Fiscal Year	92,537
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	6,867
Financing Receivable, Revolving	44,918
Financing Receivable, after Allowance for Credit Loss	43,369
Loans and Leases Receivable, Gross	527,138	547,293
Construction Loans [Member] | Potential Weakness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	554
Financing Receivable, Originated Two Years before Latest Fiscal Year	347
Financing Receivable, Originated Three Years before Latest Fiscal Year	19,044
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	347
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	20,292
Construction Loans [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	221,773
Financing Receivable, Originated Two Years before Latest Fiscal Year	114,561
Financing Receivable, Originated Three Years before Latest Fiscal Year	73,493
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	6,867
Financing Receivable, Revolving	44,225
Financing Receivable, after Allowance for Credit Loss	43,369
Loans and Leases Receivable, Gross	504,613
Construction Loans [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,887
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	346
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	2,233
Construction Loans [Member] | Partial Loss Probable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	0
Construction Loans [Member] | Definite Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	0
Small Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	31,710
Financing Receivable, Originated Two Years before Latest Fiscal Year	25,335
Financing Receivable, Originated Three Years before Latest Fiscal Year	17,912
Financing Receivable, Originated Four Years before Latest Fiscal Year	18,516
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	27,591
Financing Receivable, Revolving	48,342
Financing Receivable, after Allowance for Credit Loss	8,414
Loans and Leases Receivable, Gross	177,820	174,497
Small Business [Member] | Potential Weakness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	12
Financing Receivable, Originated Two Years before Latest Fiscal Year	18
Financing Receivable, Originated Three Years before Latest Fiscal Year	13
Financing Receivable, Originated Four Years before Latest Fiscal Year	753
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	259
Financing Receivable, Revolving	597
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	1,652
Small Business [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	31,651
Financing Receivable, Originated Two Years before Latest Fiscal Year	25,184
Financing Receivable, Originated Three Years before Latest Fiscal Year	17,848
Financing Receivable, Originated Four Years before Latest Fiscal Year	17,594
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	26,734
Financing Receivable, Revolving	47,109
Financing Receivable, after Allowance for Credit Loss	8,414
Loans and Leases Receivable, Gross	174,534
Small Business [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	47
Financing Receivable, Originated Two Years before Latest Fiscal Year	133
Financing Receivable, Originated Three Years before Latest Fiscal Year	51
Financing Receivable, Originated Four Years before Latest Fiscal Year	169
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	598
Financing Receivable, Revolving	636
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	1,634
Small Business [Member] | Partial Loss Probable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	0
Small Business [Member] | Definite Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	0
Residential Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	204,524
Financing Receivable, Originated Two Years before Latest Fiscal Year	261,326
Financing Receivable, Originated Three Years before Latest Fiscal Year	211,097
Financing Receivable, Originated Four Years before Latest Fiscal Year	283,255
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	529,092
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	39,122
Loans and Leases Receivable, Gross	1,528,416	$ 1,590,569
Residential Real Estate [Member] | Default [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	427
Financing Receivable, Originated Three Years before Latest Fiscal Year	435
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	5,350
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	6,212
Residential Real Estate [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	204,524
Financing Receivable, Originated Two Years before Latest Fiscal Year	260,899
Financing Receivable, Originated Three Years before Latest Fiscal Year	210,662
Financing Receivable, Originated Four Years before Latest Fiscal Year	283,255
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	523,742
Financing Receivable, Revolving	0
Financing Receivable, after Allowance for Credit Loss	39,122
Loans and Leases Receivable, Gross	1,522,204
Home Equity Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	75,161
Financing Receivable, Originated Two Years before Latest Fiscal Year	70,081
Financing Receivable, Originated Three Years before Latest Fiscal Year	67,758
Financing Receivable, Originated Four Years before Latest Fiscal Year	51,106
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	139,312
Financing Receivable, Revolving	717,541
Financing Receivable, after Allowance for Credit Loss	23,397
Loans and Leases Receivable, Gross	1,146,270
Home Equity Loan [Member] | Default [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	18
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	579
Financing Receivable, Revolving	2,372
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	3,030
Home Equity Loan [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	75,161
Financing Receivable, Originated Two Years before Latest Fiscal Year	70,081
Financing Receivable, Originated Three Years before Latest Fiscal Year	67,740
Financing Receivable, Originated Four Years before Latest Fiscal Year	51,106
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	138,733
Financing Receivable, Revolving	715,169
Financing Receivable, after Allowance for Credit Loss	23,397
Loans and Leases Receivable, Gross	1,143,240
Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	705
Financing Receivable, Originated Two Years before Latest Fiscal Year	356
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,068
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	10,889
Financing Receivable, Revolving	12,783
Financing Receivable, after Allowance for Credit Loss	414
Loans and Leases Receivable, Gross	27,215
Consumer Loan [Member] | Default [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	19
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	39
Financing Receivable, Revolving	16
Financing Receivable, after Allowance for Credit Loss	0
Loans and Leases Receivable, Gross	74
Consumer Loan [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	705
Financing Receivable, Originated Two Years before Latest Fiscal Year	356
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,049
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	10,850
Financing Receivable, Revolving	12,767
Financing Receivable, after Allowance for Credit Loss	414
Loans and Leases Receivable, Gross	27,141
Revolving converted to term [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	5,603
Revolving converted to term [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	2,987
Revolving converted to term [Member] | Commercial Real Estate [Member] | Potential Weakness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	2,987
Revolving converted to term [Member] | Commercial Real Estate [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Commercial Real Estate [Member] | Partial Loss Probable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Commercial Real Estate [Member] | Definite Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	377
Revolving converted to term [Member] | Commercial And Industrial [Member] | Potential Weakness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	50
Revolving converted to term [Member] | Commercial And Industrial [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	327
Revolving converted to term [Member] | Commercial And Industrial [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Commercial And Industrial [Member] | Partial Loss Probable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Commercial And Industrial [Member] | Definite Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	325
Revolving converted to term [Member] | Construction Loans [Member] | Potential Weakness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Construction Loans [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	325
Revolving converted to term [Member] | Construction Loans [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Construction Loans [Member] | Partial Loss Probable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Construction Loans [Member] | Definite Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Small Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Small Business [Member] | Potential Weakness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Small Business [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Small Business [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Small Business [Member] | Partial Loss Probable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Small Business [Member] | Definite Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Residential Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Residential Real Estate [Member] | Default [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Residential Real Estate [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Home Equity Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	1,914
Revolving converted to term [Member] | Home Equity Loan [Member] | Default [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	61
Revolving converted to term [Member] | Home Equity Loan [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	1,853
Revolving converted to term [Member] | Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Consumer Loan [Member] | Default [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Revolving converted to term [Member] | Consumer Loan [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	$ 0