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Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	$ 2,741,199	$ 4,855,463
Financing Receivable, Originated, Year Two	3,013,837	3,161,473
Financing Receivable, Originated, Year Three	2,719,070	2,651,833
Financing Receivable, Originated, Year Four	1,738,807	1,788,880
Financing Receivable, Originated, Year Five	1,367,855	1,356,476
Financing Receivable, Originated, More Than Five Years	3,484,320	3,054,469
Financing Receivable, Revolving	5,255,990	6,108,767
Financing Receivable, Revolving, Converted to Term Loan	26,858	30,159
Total	20,347,936	23,007,520
Commercial [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	1,434,310	1,657,760
Financing Receivable, Originated, Year Two	1,433,685	1,557,142
Financing Receivable, Originated, Year Three	1,304,337	1,461,282
Financing Receivable, Originated, Year Four	1,083,050	1,013,619
Financing Receivable, Originated, Year Five	802,689	747,318
Financing Receivable, Originated, More Than Five Years	1,868,188	1,603,533
Financing Receivable, Revolving	4,246,107	5,033,683
Financing Receivable, Revolving, Converted to Term Loan	2,774	3,198
Total	12,175,140	13,077,535
Commercial [Member] | Energy [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	155,300	157,690
Financing Receivable, Originated, Year Two	83,413	55,833
Financing Receivable, Originated, Year Three	35,935	90,799
Financing Receivable, Originated, Year Four	15,659	7,178
Financing Receivable, Originated, Year Five	4,987	13,815
Financing Receivable, Originated, More Than Five Years	28,742	29,020
Financing Receivable, Revolving	2,490,023	3,114,859
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	2,814,059	3,469,194
Commercial [Member] | Healthcare [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	390,345	536,745
Financing Receivable, Originated, Year Two	593,123	642,739
Financing Receivable, Originated, Year Three	619,191	639,676
Financing Receivable, Originated, Year Four	528,460	423,763
Financing Receivable, Originated, Year Five	335,625	234,531
Financing Receivable, Originated, More Than Five Years	731,264	680,890
Financing Receivable, Revolving	149,633	147,646
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	3,347,641	3,305,990
Commercial [Member] | Services [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	430,578	540,265
Financing Receivable, Originated, Year Two	506,624	452,269
Financing Receivable, Originated, Year Three	347,363	399,264
Financing Receivable, Originated, Year Four	315,362	326,282
Financing Receivable, Originated, Year Five	260,269	381,902
Financing Receivable, Originated, More Than Five Years	869,985	700,028
Financing Receivable, Revolving	592,623	707,891
Financing Receivable, Revolving, Converted to Term Loan	618	682
Total	3,323,422	3,508,583
Commercial [Member] | General business [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	458,087	423,060
Financing Receivable, Originated, Year Two	250,525	406,301
Financing Receivable, Originated, Year Three	301,848	331,543
Financing Receivable, Originated, Year Four	223,569	256,396
Financing Receivable, Originated, Year Five	201,808	117,070
Financing Receivable, Originated, More Than Five Years	238,197	193,595
Financing Receivable, Revolving	1,013,828	1,063,287
Financing Receivable, Revolving, Converted to Term Loan	2,156	2,516
Total	2,690,018	2,793,768
Commercial real estate [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	374,519	725,577
Financing Receivable, Originated, Year Two	805,102	1,219,638
Financing Receivable, Originated, Year Three	1,112,648	954,485
Financing Receivable, Originated, Year Four	486,749	506,146
Financing Receivable, Originated, Year Five	351,629	325,092
Financing Receivable, Originated, More Than Five Years	846,162	744,404
Financing Receivable, Revolving	140,050	223,158
Financing Receivable, Revolving, Converted to Term Loan	33	38
Total	4,116,892	4,698,538
Paycheck Protection Program [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	450,844	1,682,310
Financing Receivable, Originated, Year Two	85,208	0
Financing Receivable, Originated, Year Three	0	0
Financing Receivable, Originated, Year Four	0	0
Financing Receivable, Originated, Year Five	0	0
Financing Receivable, Originated, More Than Five Years	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	536,052	1,682,310
Loans to individuals [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	481,526	789,816
Financing Receivable, Originated, Year Two	689,842	384,693
Financing Receivable, Originated, Year Three	302,085	236,066
Financing Receivable, Originated, Year Four	169,008	269,115
Financing Receivable, Originated, Year Five	213,537	284,066
Financing Receivable, Originated, More Than Five Years	769,970	706,532
Financing Receivable, Revolving	869,833	851,926
Financing Receivable, Revolving, Converted to Term Loan	24,051	26,923
Total	3,519,852	3,549,137
Loans to individuals [Member] | Residential mortgage [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	326,709	565,006
Financing Receivable, Originated, Year Two	479,906	149,947
Financing Receivable, Originated, Year Three	93,979	124,678
Financing Receivable, Originated, Year Four	68,712	125,714
Financing Receivable, Originated, Year Five	80,896	160,870
Financing Receivable, Originated, More Than Five Years	357,798	371,059
Financing Receivable, Revolving	316,079	340,316
Financing Receivable, Revolving, Converted to Term Loan	23,164	25,413
Total	1,747,243	1,863,003
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	348	4,859
Financing Receivable, Originated, Year Two	10,308	33,880
Financing Receivable, Originated, Year Three	24,432	35,009
Financing Receivable, Originated, Year Four	31,185	43,099
Financing Receivable, Originated, Year Five	35,484	58,573
Financing Receivable, Originated, More Than Five Years	275,229	233,267
Financing Receivable, Revolving	0	0
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	376,986	408,687
Loans to individuals [Member] | Personal [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	154,469	219,951
Financing Receivable, Originated, Year Two	199,628	200,866
Financing Receivable, Originated, Year Three	183,674	76,379
Financing Receivable, Originated, Year Four	69,111	100,302
Financing Receivable, Originated, Year Five	97,157	64,623
Financing Receivable, Originated, More Than Five Years	136,943	102,206
Financing Receivable, Revolving	553,754	511,610
Financing Receivable, Revolving, Converted to Term Loan	887	1,510
Total	1,395,623	1,277,447
Performing [Member] | Commercial [Member] | Energy [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	154,735	112,614
Financing Receivable, Originated, Year Two	38,019	51,863
Financing Receivable, Originated, Year Three	33,135	89,346
Financing Receivable, Originated, Year Four	14,559	7,178
Financing Receivable, Originated, Year Five	4,987	1,148
Financing Receivable, Originated, More Than Five Years	19,327	7,956
Financing Receivable, Revolving	2,306,845	2,548,663
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	2,571,607	2,818,768
Performing [Member] | Commercial [Member] | Energy [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	565	0
Financing Receivable, Originated, Year Two	1,607	0
Financing Receivable, Originated, Year Three	0	0
Financing Receivable, Originated, Year Four	0	0
Financing Receivable, Originated, Year Five	0	0
Financing Receivable, Originated, More Than Five Years	0	0
Financing Receivable, Revolving	750	202,590
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	2,922	202,590
Performing [Member] | Commercial [Member] | Energy [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0	24,000
Financing Receivable, Originated, Year Two	23,065	1,363
Financing Receivable, Originated, Year Three	1,230	1,453
Financing Receivable, Originated, Year Four	1,100	0
Financing Receivable, Originated, Year Five	0	12,667
Financing Receivable, Originated, More Than Five Years	6	0
Financing Receivable, Revolving	168,629	283,294
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	194,030	322,777
Performing [Member] | Commercial [Member] | Healthcare [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	383,462	536,745
Financing Receivable, Originated, Year Two	593,123	615,221
Financing Receivable, Originated, Year Three	576,153	638,302
Financing Receivable, Originated, Year Four	521,156	422,834
Financing Receivable, Originated, Year Five	329,791	234,399
Financing Receivable, Originated, More Than Five Years	720,489	658,286
Financing Receivable, Revolving	149,119	147,132
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	3,273,293	3,252,919
Performing [Member] | Commercial [Member] | Healthcare [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	6,883	0
Financing Receivable, Originated, Year Two	0	27,500
Financing Receivable, Originated, Year Three	15,746	0
Financing Receivable, Originated, Year Four	0	0
Financing Receivable, Originated, Year Five	5,834	0
Financing Receivable, Originated, More Than Five Years	0	8,282
Financing Receivable, Revolving	5	5
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	28,468	35,787
Performing [Member] | Commercial [Member] | Healthcare [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0	0
Financing Receivable, Originated, Year Two	0	0
Financing Receivable, Originated, Year Three	27,292	1,191
Financing Receivable, Originated, Year Four	7,304	929
Financing Receivable, Originated, Year Five	0	132
Financing Receivable, Originated, More Than Five Years	10,775	11,387
Financing Receivable, Revolving	0	0
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	45,371	13,639
Performing [Member] | Commercial [Member] | Services [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	430,099	534,853
Financing Receivable, Originated, Year Two	501,607	436,384
Financing Receivable, Originated, Year Three	334,009	372,867
Financing Receivable, Originated, Year Four	298,665	307,374
Financing Receivable, Originated, Year Five	240,892	373,785
Financing Receivable, Originated, More Than Five Years	847,065	683,936
Financing Receivable, Revolving	584,197	665,491
Financing Receivable, Revolving, Converted to Term Loan	415	682
Total	3,236,949	3,375,372
Performing [Member] | Commercial [Member] | Services [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	453	150
Financing Receivable, Originated, Year Two	412	9,057
Financing Receivable, Originated, Year Three	2,779	389
Financing Receivable, Originated, Year Four	49	291
Financing Receivable, Originated, Year Five	3,318	2,038
Financing Receivable, Originated, More Than Five Years	11,085	2,000
Financing Receivable, Revolving	2,027	3,063
Financing Receivable, Revolving, Converted to Term Loan	203	0
Total	20,326	16,988
Performing [Member] | Commercial [Member] | Services [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	26	429
Financing Receivable, Originated, Year Two	76	6,380
Financing Receivable, Originated, Year Three	10,575	26,008
Financing Receivable, Originated, Year Four	16,418	6,027
Financing Receivable, Originated, Year Five	1,839	5,030
Financing Receivable, Originated, More Than Five Years	5,603	7,954
Financing Receivable, Revolving	5,896	38,797
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	40,433	90,625
Performing [Member] | Commercial [Member] | General business [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	457,490	419,756
Financing Receivable, Originated, Year Two	246,333	394,985
Financing Receivable, Originated, Year Three	295,089	310,273
Financing Receivable, Originated, Year Four	212,899	236,222
Financing Receivable, Originated, Year Five	188,407	103,987
Financing Receivable, Originated, More Than Five Years	230,442	186,600
Financing Receivable, Revolving	1,002,036	1,055,878
Financing Receivable, Revolving, Converted to Term Loan	2,025	2,316
Total	2,634,721	2,710,017
Performing [Member] | Commercial [Member] | General business [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	232	197
Financing Receivable, Originated, Year Two	1,380	4,519
Financing Receivable, Originated, Year Three	66	9,713
Financing Receivable, Originated, Year Four	1,469	7,803
Financing Receivable, Originated, Year Five	3,937	2,511
Financing Receivable, Originated, More Than Five Years	318	3,159
Financing Receivable, Revolving	8,697	2,483
Financing Receivable, Revolving, Converted to Term Loan	0	19
Total	16,099	30,404
Performing [Member] | Commercial [Member] | General business [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	365	1,432
Financing Receivable, Originated, Year Two	1,230	3,069
Financing Receivable, Originated, Year Three	2,458	6,694
Financing Receivable, Originated, Year Four	7,961	10,935
Financing Receivable, Originated, Year Five	8,694	10,042
Financing Receivable, Originated, More Than Five Years	6,906	3,729
Financing Receivable, Revolving	2,633	4,449
Financing Receivable, Revolving, Converted to Term Loan	0	140
Total	30,247	40,490
Performing [Member] | Commercial real estate [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	374,519	725,577
Financing Receivable, Originated, Year Two	805,102	1,211,338
Financing Receivable, Originated, Year Three	1,104,404	954,226
Financing Receivable, Originated, Year Four	466,778	489,193
Financing Receivable, Originated, Year Five	336,206	314,899
Financing Receivable, Originated, More Than Five Years	822,068	722,475
Financing Receivable, Revolving	140,050	223,131
Financing Receivable, Revolving, Converted to Term Loan	33	38
Total	4,049,160	4,640,877
Performing [Member] | Commercial real estate [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0	0
Financing Receivable, Originated, Year Two	0	0
Financing Receivable, Originated, Year Three	0	259
Financing Receivable, Originated, Year Four	6,683	12,311
Financing Receivable, Originated, Year Five	10,943	2,725
Financing Receivable, Originated, More Than Five Years	6,760	5,831
Financing Receivable, Revolving	0	0
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	24,386	21,126
Performing [Member] | Commercial real estate [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0	0
Financing Receivable, Originated, Year Two	0	0
Financing Receivable, Originated, Year Three	0	0
Financing Receivable, Originated, Year Four	13,288	4,410
Financing Receivable, Originated, Year Five	4,480	0
Financing Receivable, Originated, More Than Five Years	4,355	4,852
Financing Receivable, Revolving	0	27
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	22,123	9,289
Performing [Member] | Paycheck Protection Program [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	450,844	1,682,310
Financing Receivable, Originated, Year Two	85,208	0
Financing Receivable, Originated, Year Three	0	0
Financing Receivable, Originated, Year Four	0	0
Financing Receivable, Originated, Year Five	0	0
Financing Receivable, Originated, More Than Five Years	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	536,052	1,682,310
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	325,951	564,325
Financing Receivable, Originated, Year Two	478,460	149,832
Financing Receivable, Originated, Year Three	93,556	120,875
Financing Receivable, Originated, Year Four	67,648	124,930
Financing Receivable, Originated, Year Five	80,208	158,801
Financing Receivable, Originated, More Than Five Years	333,932	348,292
Financing Receivable, Revolving	313,255	335,259
Financing Receivable, Revolving, Converted to Term Loan	22,305	24,553
Total	1,715,315	1,826,867
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0	33
Financing Receivable, Originated, Year Two	0	11
Financing Receivable, Originated, Year Three	82	2,094
Financing Receivable, Originated, Year Four	13	0
Financing Receivable, Originated, Year Five	0	59
Financing Receivable, Originated, More Than Five Years	283	318
Financing Receivable, Revolving	248	950
Financing Receivable, Revolving, Converted to Term Loan	0	10
Total	626	3,475
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0	0
Financing Receivable, Originated, Year Two	0	0
Financing Receivable, Originated, Year Three	0	51
Financing Receivable, Originated, Year Four	0	0
Financing Receivable, Originated, Year Five	0	0
Financing Receivable, Originated, More Than Five Years	126	34
Financing Receivable, Revolving	479	272
Financing Receivable, Revolving, Converted to Term Loan	23	76
Total	628	433
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	348	4,859
Financing Receivable, Originated, Year Two	10,308	33,880
Financing Receivable, Originated, Year Three	24,350	34,464
Financing Receivable, Originated, Year Four	30,941	43,099
Financing Receivable, Originated, Year Five	35,341	58,264
Financing Receivable, Originated, More Than Five Years	266,510	226,380
Financing Receivable, Revolving	0	0
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	367,798	400,946
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	154,436	219,873
Financing Receivable, Originated, Year Two	199,604	200,580
Financing Receivable, Originated, Year Three	183,461	76,246
Financing Receivable, Originated, Year Four	69,075	100,229
Financing Receivable, Originated, Year Five	97,119	64,104
Financing Receivable, Originated, More Than Five Years	136,837	102,126
Financing Receivable, Revolving	553,702	510,571
Financing Receivable, Revolving, Converted to Term Loan	887	1,510
Total	1,395,121	1,275,239
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	14	39
Financing Receivable, Originated, Year Two	15	55
Financing Receivable, Originated, Year Three	23	66
Financing Receivable, Originated, Year Four	10	0
Financing Receivable, Originated, Year Five	0	469
Financing Receivable, Originated, More Than Five Years	45	31
Financing Receivable, Revolving	5	965
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	112	1,625
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0	11
Financing Receivable, Originated, Year Two	0	214
Financing Receivable, Originated, Year Three	180	10
Financing Receivable, Originated, Year Four	1	0
Financing Receivable, Originated, Year Five	0	0
Financing Receivable, Originated, More Than Five Years	0	0
Financing Receivable, Revolving	21	29
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	202	264
Nonperforming Financial Instruments [Member] | Commercial [Member] | Energy [Member] | Nonaccrual [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0	21,076
Financing Receivable, Originated, Year Two	20,722	2,607
Financing Receivable, Originated, Year Three	1,570	0
Financing Receivable, Originated, Year Four	0	0
Financing Receivable, Originated, Year Five	0	0
Financing Receivable, Originated, More Than Five Years	9,409	21,064
Financing Receivable, Revolving	13,799	80,312
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	45,500	125,059
Nonperforming Financial Instruments [Member] | Commercial [Member] | Healthcare [Member] | Nonaccrual [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0	0
Financing Receivable, Originated, Year Two	0	18
Financing Receivable, Originated, Year Three	0	183
Financing Receivable, Originated, Year Four	0	0
Financing Receivable, Originated, Year Five	0	0
Financing Receivable, Originated, More Than Five Years	0	2,935
Financing Receivable, Revolving	509	509
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	509	3,645
Nonperforming Financial Instruments [Member] | Commercial [Member] | Services [Member] | Nonaccrual [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0	4,833
Financing Receivable, Originated, Year Two	4,529	448
Financing Receivable, Originated, Year Three	0	0
Financing Receivable, Originated, Year Four	230	12,590
Financing Receivable, Originated, Year Five	14,220	1,049
Financing Receivable, Originated, More Than Five Years	6,232	6,138
Financing Receivable, Revolving	503	540
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	25,714	25,598
Nonperforming Financial Instruments [Member] | Commercial [Member] | General business [Member] | Nonaccrual [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0	1,675
Financing Receivable, Originated, Year Two	1,582	3,728
Financing Receivable, Originated, Year Three	4,235	4,863
Financing Receivable, Originated, Year Four	1,240	1,436
Financing Receivable, Originated, Year Five	770	530
Financing Receivable, Originated, More Than Five Years	531	107
Financing Receivable, Revolving	462	477
Financing Receivable, Revolving, Converted to Term Loan	131	41
Total	8,951	12,857
Nonperforming Financial Instruments [Member] | Commercial real estate [Member] | Nonaccrual [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0	0
Financing Receivable, Originated, Year Two	0	8,300
Financing Receivable, Originated, Year Three	8,244	0
Financing Receivable, Originated, Year Four	0	232
Financing Receivable, Originated, Year Five	0	7,468
Financing Receivable, Originated, More Than Five Years	12,979	11,246
Financing Receivable, Revolving	0	0
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	21,223	27,246
Nonperforming Financial Instruments [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Nonaccrual [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	758	648
Financing Receivable, Originated, Year Two	1,446	104
Financing Receivable, Originated, Year Three	341	1,658
Financing Receivable, Originated, Year Four	1,051	784
Financing Receivable, Originated, Year Five	688	2,010
Financing Receivable, Originated, More Than Five Years	23,457	22,415
Financing Receivable, Revolving	2,097	3,835
Financing Receivable, Revolving, Converted to Term Loan	836	774
Total	30,674	32,228
Nonperforming Financial Instruments [Member] | Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | Nonaccrual [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0	0
Financing Receivable, Originated, Year Two	0	0
Financing Receivable, Originated, Year Three	82	545
Financing Receivable, Originated, Year Four	244	0
Financing Receivable, Originated, Year Five	143	309
Financing Receivable, Originated, More Than Five Years	8,719	6,887
Financing Receivable, Revolving	0	0
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	9,188	7,741
Nonperforming Financial Instruments [Member] | Loans to individuals [Member] | Personal [Member] | Nonaccrual [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	19	28
Financing Receivable, Originated, Year Two	9	17
Financing Receivable, Originated, Year Three	10	57
Financing Receivable, Originated, Year Four	25	73
Financing Receivable, Originated, Year Five	38	50
Financing Receivable, Originated, More Than Five Years	61	49
Financing Receivable, Revolving	26	45
Financing Receivable, Revolving, Converted to Term Loan	0	0
Total	$ 188	$ 319

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