Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	$ 2,910,988		$ 2,910,988		$ 4,453,665
Financing Receivable, Originated, Year Two	4,421,382		4,421,382		3,294,886
Financing Receivable, Originated, Year Three	3,061,168		3,061,168		2,107,063
Financing Receivable, Originated, Year Four	1,861,717		1,861,717		1,734,561
Financing Receivable, Originated, Year Five	1,414,757		1,414,757		1,157,972
Financing Receivable, Originated, More Than Five Years	3,386,085		3,386,085		2,992,242
Financing Receivable, Revolving	6,641,137		6,641,137		6,790,248
Financing Receivable, Revolving, Converted to Term Loan	26,784		26,784		26,513
Total	23,724,018		23,724,018		22,557,150
Financing Receivable, Allowance for Credit Loss, Writeoff	10,593	$ 1,766	22,309	$ 10,939
Commercial [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	2,066,760		2,066,760		2,655,782
Financing Receivable, Originated, Year Two	2,127,122		2,127,122		1,566,129
Financing Receivable, Originated, Year Three	1,328,425		1,328,425		994,261
Financing Receivable, Originated, Year Four	879,790		879,790		838,006
Financing Receivable, Originated, Year Five	652,330		652,330		779,311
Financing Receivable, Originated, More Than Five Years	2,055,950		2,055,950		1,657,429
Financing Receivable, Revolving	5,606,303		5,606,303		5,718,433
Financing Receivable, Revolving, Converted to Term Loan	3,159		3,159		3,148
Total	14,719,839		14,719,839		14,212,499
Financing Receivable, Allowance for Credit Loss, Writeoff	6,769	75	9,578	6,162
Commercial [Member] | Energy [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	192,614		192,614		157,745
Financing Receivable Year One Originated Current Fiscal Year Writeoff			0
Financing Receivable, Originated, Year Two	106,593		106,593		76,951
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff			0
Financing Receivable, Originated, Year Three	45,795		45,795		30,284
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff			0
Financing Receivable, Originated, Year Four	8,190		8,190		13,447
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff			0
Financing Receivable, Originated, Year Five	10,463		10,463		6,377
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff			0
Financing Receivable, Originated, More Than Five Years	12,626		12,626		5,822
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff			0
Financing Receivable, Revolving	3,114,321		3,114,321		3,134,164
Financing Receivable Revolving Writeoff			0
Financing Receivable, Revolving, Converted to Term Loan	0		0		0
Financing Receivable Revolving Converted to Term Writeoff			0
Total	3,490,602		3,490,602		3,424,790
Financing Receivable, Allowance for Credit Loss, Writeoff			0
Commercial [Member] | Healthcare [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	485,617		485,617		932,097
Financing Receivable Year One Originated Current Fiscal Year Writeoff			0
Financing Receivable, Originated, Year Two	903,739		903,739		604,886
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff			0
Financing Receivable, Originated, Year Three	592,250		592,250		476,854
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff			0
Financing Receivable, Originated, Year Four	471,127		471,127		450,755
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff			0
Financing Receivable, Originated, Year Five	367,162		367,162		471,362
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff			0
Financing Receivable, Originated, More Than Five Years	986,224		986,224		659,507
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff			0
Financing Receivable, Revolving	276,999		276,999		249,536
Financing Receivable Revolving Writeoff			0
Financing Receivable, Revolving, Converted to Term Loan	16		16		20
Financing Receivable Revolving Converted to Term Writeoff			0
Total	4,083,134		4,083,134		3,845,017
Financing Receivable, Allowance for Credit Loss, Writeoff			0
Commercial [Member] | Services [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	707,494		707,494		822,287
Financing Receivable Year One Originated Current Fiscal Year Writeoff			0
Financing Receivable, Originated, Year Two	560,342		560,342		507,219
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff			0
Financing Receivable, Originated, Year Three	417,177		417,177		287,523
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff			3,360
Financing Receivable, Originated, Year Four	250,676		250,676		196,711
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff			0
Financing Receivable, Originated, Year Five	134,198		134,198		157,673
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff			0
Financing Receivable, Originated, More Than Five Years	729,544		729,544		702,823
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff			0
Financing Receivable, Revolving	766,027		766,027		756,524
Financing Receivable Revolving Writeoff			1,577
Financing Receivable, Revolving, Converted to Term Loan	903		903		761
Financing Receivable Revolving Converted to Term Writeoff			0
Total	3,566,361		3,566,361		3,431,521
Financing Receivable, Allowance for Credit Loss, Writeoff			4,937
Commercial [Member] | General business [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	681,035		681,035		743,653
Financing Receivable Year One Originated Current Fiscal Year Writeoff			0
Financing Receivable, Originated, Year Two	556,448		556,448		377,073
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff			0
Financing Receivable, Originated, Year Three	273,203		273,203		199,600
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff			4,598
Financing Receivable, Originated, Year Four	149,797		149,797		177,093
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff			2
Financing Receivable, Originated, Year Five	140,507		140,507		143,899
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff			0
Financing Receivable, Originated, More Than Five Years	327,556		327,556		289,277
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff			17
Financing Receivable, Revolving	1,448,956		1,448,956		1,578,209
Financing Receivable Revolving Writeoff			14
Financing Receivable, Revolving, Converted to Term Loan	2,240		2,240		2,367
Financing Receivable Revolving Converted to Term Writeoff			10
Total	3,579,742		3,579,742		3,511,171
Financing Receivable, Allowance for Credit Loss, Writeoff			4,641
Commercial real estate [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	361,934		361,934		1,188,483
Financing Receivable Year One Originated Current Fiscal Year Writeoff			0
Financing Receivable, Originated, Year Two	1,730,828		1,730,828		1,158,002
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff			0
Financing Receivable, Originated, Year Three	1,211,773		1,211,773		552,616
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff			0
Financing Receivable, Originated, Year Four	480,710		480,710		648,561
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff			0
Financing Receivable, Originated, Year Five	563,165		563,165		247,625
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff			0
Financing Receivable, Originated, More Than Five Years	753,169		753,169		649,874
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff			8,446
Financing Receivable, Revolving	139,721		139,721		161,616
Financing Receivable Revolving Writeoff			0
Financing Receivable, Revolving, Converted to Term Loan	0		0		0
Financing Receivable Revolving Converted to Term Writeoff			0
Total	5,241,300		5,241,300		4,606,777
Financing Receivable, Allowance for Credit Loss, Writeoff	2,238	0	8,446	269
Loans to individuals [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	482,294		482,294		609,400
Financing Receivable, Originated, Year Two	563,432		563,432		570,755
Financing Receivable, Originated, Year Three	520,970		520,970		560,186
Financing Receivable, Originated, Year Four	501,217		501,217		247,994
Financing Receivable, Originated, Year Five	199,262		199,262		131,036
Financing Receivable, Originated, More Than Five Years	576,966		576,966		684,939
Financing Receivable, Revolving	895,113		895,113		910,199
Financing Receivable, Revolving, Converted to Term Loan	23,625		23,625		23,365
Total	3,762,879		3,762,879		3,737,874
Financing Receivable, Allowance for Credit Loss, Writeoff	1,586	$ 1,691	4,285	$ 4,508
Loans to individuals [Member] | Residential mortgage [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	320,680		320,680		354,529
Financing Receivable Year One Originated Current Fiscal Year Writeoff			0
Financing Receivable, Originated, Year Two	334,025		334,025		374,927
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff			0
Financing Receivable, Originated, Year Three	351,267		351,267		395,948
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff			51
Financing Receivable, Originated, Year Four	358,394		358,394		63,504
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff			4
Financing Receivable, Originated, Year Five	58,667		58,667		42,571
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff			0
Financing Receivable, Originated, More Than Five Years	272,952		272,952		281,290
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff			14
Financing Receivable, Revolving	371,577		371,577		354,986
Financing Receivable Revolving Writeoff			1
Financing Receivable, Revolving, Converted to Term Loan	23,430		23,430		23,029
Financing Receivable Revolving Converted to Term Writeoff			0
Total	2,090,992		2,090,992		1,890,784
Financing Receivable, Allowance for Credit Loss, Writeoff			70
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	0		0		289
Financing Receivable, Originated, Year Two	1,624		1,624		2,254
Financing Receivable, Originated, Year Three	2,030		2,030		9,299
Financing Receivable, Originated, Year Four	5,029		5,029		12,182
Financing Receivable, Originated, Year Five	7,128		7,128		19,563
Financing Receivable, Originated, More Than Five Years	145,281		145,281		202,353
Financing Receivable, Revolving	0		0		0
Financing Receivable, Revolving, Converted to Term Loan	0		0		0
Total	161,092		161,092		245,940
Loans to individuals [Member] | Personal [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	161,614		161,614		254,582
Financing Receivable Year One Originated Current Fiscal Year Writeoff			0
Financing Receivable, Originated, Year Two	227,783		227,783		193,574
Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff			60
Financing Receivable, Originated, Year Three	167,673		167,673		154,939
Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff			40
Financing Receivable, Originated, Year Four	137,794		137,794		172,308
Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff			41
Financing Receivable, Originated, Year Five	133,467		133,467		68,902
Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff			0
Financing Receivable, Originated, More Than Five Years	158,733		158,733		201,296
Financing Receivable Originated More than Five Years Before Current Fiscal Year Writeoff			4,042
Financing Receivable, Revolving	523,536		523,536		555,213
Financing Receivable Revolving Writeoff			26
Financing Receivable, Revolving, Converted to Term Loan	195		195		336
Financing Receivable Revolving Converted to Term Writeoff			6
Total	1,510,795		1,510,795		1,601,150
Financing Receivable, Allowance for Credit Loss, Writeoff			4,215
Performing [Member] | Commercial [Member] | Energy [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	192,614		192,614		157,745
Financing Receivable, Originated, Year Two	106,593		106,593		76,951
Financing Receivable, Originated, Year Three	45,795		45,795		30,284
Financing Receivable, Originated, Year Four	8,190		8,190		12,783
Financing Receivable, Originated, Year Five	10,463		10,463		5,992
Financing Receivable, Originated, More Than Five Years	12,518		12,518		4,980
Financing Receivable, Revolving	3,064,120		3,064,120		3,104,906
Financing Receivable, Revolving, Converted to Term Loan	0		0		0
Total	3,440,293		3,440,293		3,393,641
Performing [Member] | Commercial [Member] | Energy [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		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	13,950		13,950
Financing Receivable, Revolving, Converted to Term Loan	0		0
Total	13,950		13,950
Performing [Member] | Commercial [Member] | Energy [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0		0		0
Financing Receivable, Originated, Year Two	0		0		0
Financing Receivable, Originated, Year Three	0		0		0
Financing Receivable, Originated, Year Four	0		0		664
Financing Receivable, Originated, Year Five	0		0		385
Financing Receivable, Originated, More Than Five Years	0		0		683
Financing Receivable, Revolving	16,800		16,800		28,018
Financing Receivable, Revolving, Converted to Term Loan	0		0		0
Total	16,800		16,800		29,750
Performing [Member] | Commercial [Member] | Healthcare [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	485,617		485,617		932,097
Financing Receivable, Originated, Year Two	903,150		903,150		604,886
Financing Receivable, Originated, Year Three	573,317		573,317		476,854
Financing Receivable, Originated, Year Four	464,170		464,170		404,204
Financing Receivable, Originated, Year Five	338,944		338,944		464,989
Financing Receivable, Originated, More Than Five Years	947,581		947,581		618,163
Financing Receivable, Revolving	268,806		268,806		245,898
Financing Receivable, Revolving, Converted to Term Loan	16		16		20
Total	3,981,601		3,981,601		3,747,111
Performing [Member] | Commercial [Member] | Healthcare [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0		0		0
Financing Receivable, Originated, Year Two	0		0		0
Financing Receivable, Originated, Year Three	18,719		18,719		0
Financing Receivable, Originated, Year Four	0		0		20,071
Financing Receivable, Originated, Year Five	2,421		2,421		0
Financing Receivable, Originated, More Than Five Years	18,072		18,072		18,859
Financing Receivable, Revolving	980		980		4
Financing Receivable, Revolving, Converted to Term Loan	0		0		0
Total	40,192		40,192		38,934
Performing [Member] | Commercial [Member] | Healthcare [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0		0		0
Financing Receivable, Originated, Year Two	589		589		0
Financing Receivable, Originated, Year Three	214		214		0
Financing Receivable, Originated, Year Four	6,957		6,957		0
Financing Receivable, Originated, Year Five	0		0		0
Financing Receivable, Originated, More Than Five Years	10,046		10,046		14,304
Financing Receivable, Revolving	1,700		1,700		3,634
Financing Receivable, Revolving, Converted to Term Loan	0		0		0
Total	19,506		19,506		17,938
Performing [Member] | Commercial [Member] | Services [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	707,494		707,494		821,785
Financing Receivable, Originated, Year Two	541,539		541,539		496,510
Financing Receivable, Originated, Year Three	412,450		412,450		286,085
Financing Receivable, Originated, Year Four	247,092		247,092		193,481
Financing Receivable, Originated, Year Five	131,269		131,269		156,736
Financing Receivable, Originated, More Than Five Years	723,365		723,365		696,300
Financing Receivable, Revolving	759,327		759,327		722,371
Financing Receivable, Revolving, Converted to Term Loan	870		870		639
Total	3,523,406		3,523,406		3,373,907
Performing [Member] | Commercial [Member] | Services [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0		0		502
Financing Receivable, Originated, Year Two	13,051		13,051		5,139
Financing Receivable, Originated, Year Three	1,836		1,836		989
Financing Receivable, Originated, Year Four	1,531		1,531		771
Financing Receivable, Originated, Year Five	596		596		894
Financing Receivable, Originated, More Than Five Years	2,733		2,733		1,345
Financing Receivable, Revolving	1,421		1,421		8,668
Financing Receivable, Revolving, Converted to Term Loan	0		0		0
Total	21,168		21,168		18,308
Performing [Member] | Commercial [Member] | Services [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0		0		0
Financing Receivable, Originated, Year Two	5,752		5,752		0
Financing Receivable, Originated, Year Three	730		730		0
Financing Receivable, Originated, Year Four	1,716		1,716		2,459
Financing Receivable, Originated, Year Five	2,333		2,333		43
Financing Receivable, Originated, More Than Five Years	3,446		3,446		2,789
Financing Receivable, Revolving	4,957		4,957		17,665
Financing Receivable, Revolving, Converted to Term Loan	33		33		122
Total	18,967		18,967		23,078
Performing [Member] | Commercial [Member] | General business [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	667,802		667,802		725,894
Financing Receivable, Originated, Year Two	504,364		504,364		361,839
Financing Receivable, Originated, Year Three	262,660		262,660		198,274
Financing Receivable, Originated, Year Four	148,645		148,645		172,878
Financing Receivable, Originated, Year Five	140,220		140,220		139,140
Financing Receivable, Originated, More Than Five Years	319,113		319,113		283,694
Financing Receivable, Revolving	1,396,919		1,396,919		1,570,536
Financing Receivable, Revolving, Converted to Term Loan	2,196		2,196		2,329
Total	3,441,919		3,441,919		3,454,584
Performing [Member] | Commercial [Member] | General business [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	9,277		9,277		17,759
Financing Receivable, Originated, Year Two	15,059		15,059		13,065
Financing Receivable, Originated, Year Three	9,103		9,103		208
Financing Receivable, Originated, Year Four	1,115		1,115		71
Financing Receivable, Originated, Year Five	287		287		7
Financing Receivable, Originated, More Than Five Years	8,389		8,389		2,291
Financing Receivable, Revolving	7,959		7,959		7,094
Financing Receivable, Revolving, Converted to Term Loan	0		0		26
Total	51,189		51,189		40,521
Performing [Member] | Commercial [Member] | General business [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	3,956		3,956		0
Financing Receivable, Originated, Year Two	37,025		37,025		2,169
Financing Receivable, Originated, Year Three	1,440		1,440		66
Financing Receivable, Originated, Year Four	37		37		4,130
Financing Receivable, Originated, Year Five	0		0		4,680
Financing Receivable, Originated, More Than Five Years	0		0		3,287
Financing Receivable, Revolving	37,693		37,693		94
Financing Receivable, Revolving, Converted to Term Loan	0		0		4
Total	80,151		80,151		14,430
Performing [Member] | Commercial real estate [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	361,934		361,934		1,188,483
Financing Receivable, Originated, Year Two	1,730,828		1,730,828		1,158,002
Financing Receivable, Originated, Year Three	1,211,694		1,211,694		552,616
Financing Receivable, Originated, Year Four	480,710		480,710		641,102
Financing Receivable, Originated, Year Five	555,902		555,902		247,625
Financing Receivable, Originated, More Than Five Years	723,783		723,783		633,304
Financing Receivable, Revolving	139,721		139,721		161,616
Financing Receivable, Revolving, Converted to Term Loan	0		0		0
Total	5,204,572		5,204,572		4,582,748
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		0
Financing Receivable, Originated, Year Four	0		0
Financing Receivable, Originated, Year Five	0		0
Financing Receivable, Originated, More Than Five Years	19,212		19,212
Financing Receivable, Revolving	0		0
Financing Receivable, Revolving, Converted to Term Loan	0		0
Total	19,212		19,212
Performing [Member] | Commercial real estate [Member] | Accruing Substandard [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0		0		0
Financing Receivable, Originated, Year Two	0		0		0
Financing Receivable, Originated, Year Three	79		79		0
Financing Receivable, Originated, Year Four	0		0		7,459
Financing Receivable, Originated, Year Five	0		0		0
Financing Receivable, Originated, More Than Five Years	10,019		10,019		0
Financing Receivable, Revolving	0		0		0
Financing Receivable, Revolving, Converted to Term Loan	0		0		0
Total	10,098		10,098		7,459
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	320,680		320,680		354,497
Financing Receivable, Originated, Year Two	332,368		332,368		373,190
Financing Receivable, Originated, Year Three	348,782		348,782		393,002
Financing Receivable, Originated, Year Four	354,284		354,284		63,142
Financing Receivable, Originated, Year Five	57,944		57,944		40,525
Financing Receivable, Originated, More Than Five Years	252,027		252,027		260,625
Financing Receivable, Revolving	366,136		366,136		352,126
Financing Receivable, Revolving, Converted to Term Loan	22,277		22,277		22,176
Total	2,054,498		2,054,498		1,859,283
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		0		0
Financing Receivable, Originated, Year Two	359		359		81
Financing Receivable, Originated, Year Three	262		262		42
Financing Receivable, Originated, Year Four	1,339		1,339		0
Financing Receivable, Originated, Year Five	0		0		142
Financing Receivable, Originated, More Than Five Years	152		152		388
Financing Receivable, Revolving	3,144		3,144		527
Financing Receivable, Revolving, Converted to Term Loan	88		88		87
Total	5,344		5,344		1,267
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		0
Financing Receivable, Originated, Year Two	0		0		0
Financing Receivable, Originated, Year Three	0		0		187
Financing Receivable, Originated, Year Four	0		0		0
Financing Receivable, Originated, Year Five	0		0		0
Financing Receivable, Originated, More Than Five Years	45		45		138
Financing Receivable, Revolving	101		101		117
Financing Receivable, Revolving, Converted to Term Loan	51		51		1
Total	197		197		443
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	0		0		289
Financing Receivable, Originated, Year Two	1,624		1,624		2,254
Financing Receivable, Originated, Year Three	2,030		2,030		9,000
Financing Receivable, Originated, Year Four	4,749		4,749		10,722
Financing Receivable, Originated, Year Five	6,752		6,752		17,244
Financing Receivable, Originated, More Than Five Years	135,502		135,502		191,426
Financing Receivable, Revolving	0		0		0
Financing Receivable, Revolving, Converted to Term Loan	0		0		0
Total	150,657		150,657		230,935
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	161,514		161,514		254,497
Financing Receivable, Originated, Year Two	227,726		227,726		193,095
Financing Receivable, Originated, Year Three	167,566		167,566		154,887
Financing Receivable, Originated, Year Four	137,761		137,761		172,114
Financing Receivable, Originated, Year Five	133,304		133,304		68,871
Financing Receivable, Originated, More Than Five Years	158,721		158,721		201,278
Financing Receivable, Revolving	523,513		523,513		549,187
Financing Receivable, Revolving, Converted to Term Loan	195		195		332
Total	1,510,300		1,510,300		1,594,261
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	100		100		47
Financing Receivable, Originated, Year Two	30		30		28
Financing Receivable, Originated, Year Three	103		103		40
Financing Receivable, Originated, Year Four	22		22		12
Financing Receivable, Originated, Year Five	2		2		17
Financing Receivable, Originated, More Than Five Years	0		0		0
Financing Receivable, Revolving	0		0		6,003
Financing Receivable, Revolving, Converted to Term Loan	0		0		4
Total	257		257		6,151
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		0		0
Financing Receivable, Originated, Year Two	0		0		444
Financing Receivable, Originated, Year Three	0		0		0
Financing Receivable, Originated, Year Four	2		2		160
Financing Receivable, Originated, Year Five	157		157		0
Financing Receivable, Originated, More Than Five Years	0		0		0
Financing Receivable, Revolving	0		0		0
Financing Receivable, Revolving, Converted to Term Loan	0		0		0
Total	159		159		604
Nonperforming Financial Instruments [Member] | Commercial [Member] | Energy [Member] | Nonaccrual [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0		0		0
Financing Receivable, Originated, Year Two	0		0		0
Financing Receivable, Originated, Year Three	0		0		0
Financing Receivable, Originated, Year Four	0		0		0
Financing Receivable, Originated, Year Five	0		0		0
Financing Receivable, Originated, More Than Five Years	108		108		159
Financing Receivable, Revolving	19,451		19,451		1,240
Financing Receivable, Revolving, Converted to Term Loan	0		0		0
Total	19,559		19,559		1,399
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		0
Financing Receivable, Originated, Year Two	0		0		0
Financing Receivable, Originated, Year Three	0		0		0
Financing Receivable, Originated, Year Four	0		0		26,480
Financing Receivable, Originated, Year Five	25,797		25,797		6,373
Financing Receivable, Originated, More Than Five Years	10,525		10,525		8,181
Financing Receivable, Revolving	5,513		5,513		0
Financing Receivable, Revolving, Converted to Term Loan	0		0		0
Total	41,835		41,835		41,034
Nonperforming Financial Instruments [Member] | Commercial [Member] | Services [Member] | Nonaccrual [Member]
Financing Receivable, Credit Quality Indicator Line Items [Abstract]
Financing Receivable, Originated, Year One	0		0		0
Financing Receivable, Originated, Year Two	0		0		5,570
Financing Receivable, Originated, Year Three	2,161		2,161		449
Financing Receivable, Originated, Year Four	337		337		0
Financing Receivable, Originated, Year Five	0		0		0
Financing Receivable, Originated, More Than Five Years	0		0		2,389
Financing Receivable, Revolving	322		322		7,820
Financing Receivable, Revolving, Converted to Term Loan	0		0		0
Total	2,820		2,820		16,228
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		0		0
Financing Receivable, Originated, Year Two	0		0		0
Financing Receivable, Originated, Year Three	0		0		1,052
Financing Receivable, Originated, Year Four	0		0		14
Financing Receivable, Originated, Year Five	0		0		72
Financing Receivable, Originated, More Than Five Years	54		54		5
Financing Receivable, Revolving	6,385		6,385		485
Financing Receivable, Revolving, Converted to Term Loan	44		44		8
Total	6,483		6,483		1,636
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		0
Financing Receivable, Originated, Year Two	0		0		0
Financing Receivable, Originated, Year Three	0		0		0
Financing Receivable, Originated, Year Four	0		0		0
Financing Receivable, Originated, Year Five	7,263		7,263		0
Financing Receivable, Originated, More Than Five Years	155		155		16,570
Financing Receivable, Revolving	0		0		0
Financing Receivable, Revolving, Converted to Term Loan	0		0		0
Total	7,418		7,418		16,570
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	0		0		32
Financing Receivable, Originated, Year Two	1,298		1,298		1,656
Financing Receivable, Originated, Year Three	2,223		2,223		2,717
Financing Receivable, Originated, Year Four	2,771		2,771		362
Financing Receivable, Originated, Year Five	723		723		1,904
Financing Receivable, Originated, More Than Five Years	20,728		20,728		20,139
Financing Receivable, Revolving	2,196		2,196		2,216
Financing Receivable, Revolving, Converted to Term Loan	1,014		1,014		765
Total	30,953		30,953		29,791
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		0
Financing Receivable, Originated, Year Two	0		0		0
Financing Receivable, Originated, Year Three	0		0		299
Financing Receivable, Originated, Year Four	280		280		1,460
Financing Receivable, Originated, Year Five	376		376		2,319
Financing Receivable, Originated, More Than Five Years	9,779		9,779		10,927
Financing Receivable, Revolving	0		0		0
Financing Receivable, Revolving, Converted to Term Loan	0		0		0
Total	10,435		10,435		15,005
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	0		0		38
Financing Receivable, Originated, Year Two	27		27		7
Financing Receivable, Originated, Year Three	4		4		12
Financing Receivable, Originated, Year Four	9		9		22
Financing Receivable, Originated, Year Five	4		4		14
Financing Receivable, Originated, More Than Five Years	12		12		18
Financing Receivable, Revolving	23		23		23
Financing Receivable, Revolving, Converted to Term Loan	0		0		0
Total	$ 79		$ 79		$ 134