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Loans and Allowance for Credit Losses - Schedule of Risk Rating and Payment Performance (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 13,584,828	$ 13,786,479
Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	13,584,828	13,786,479
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	3,505,183	3,956,422
Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	917,422	1,709,047
Originated one year before current year	667,949	440,462
Originated two years before current year	333,239	202,025
Originated three years before current year	140,186	256,753
Originated four years before current year	184,266	130,543
Originated more than five years before current fiscal year	257,501	281,337
Revolving	623,826	576,278
Revolving to Term	188,404	161,255
Total loans	3,312,793	3,757,700
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,290,632	5,946,512
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	1,091,880	1,556,959
Originated one year before current year	1,579,590	1,099,162
Originated two years before current year	965,700	794,524
Originated three years before current year	624,542	779,186
Originated four years before current year	622,631	539,960
Originated more than five years before current fiscal year	770,832	571,651
Revolving	25,555	28,122
Revolving to Term	451,605	405,247
Total loans	6,132,335	5,774,811
BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	61,081	96,821
Originated one year before current year	78,642	77,287
Originated two years before current year	60,393	51,672
Originated three years before current year	40,101	37,218
Originated four years before current year	28,522	25,622
Originated more than five years before current fiscal year	13,220	5,357
Revolving	46,720	53,667
Revolving to Term	22,008	22,779
Total loans	350,687	370,423
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	476,235	624,500
Originated one year before current year	659,727	453,383
Originated two years before current year	304,883	132,787
Originated three years before current year	82,268	191,268
Originated four years before current year	120,626	204,588
Originated more than five years before current fiscal year	580,933	641,774
Revolving	0	0
Revolving to Term	110	122
Total loans	2,224,782	2,248,422
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,224,782	2,248,422
Residential real estate | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	476,235	624,435
Originated one year before current year	659,413	453,132
Originated two years before current year	304,715	132,107
Originated three years before current year	81,974	190,376
Originated four years before current year	119,596	202,457
Originated more than five years before current fiscal year	563,796	620,999
Revolving	0	0
Revolving to Term	110	122
Total loans	2,205,839	2,223,628
Residential real estate | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	0	65
Originated one year before current year	314	251
Originated two years before current year	168	680
Originated three years before current year	294	892
Originated four years before current year	1,030	2,131
Originated more than five years before current fiscal year	17,137	20,775
Revolving	0	0
Revolving to Term	0	0
Total loans	18,943	24,794
Indirect
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	266,010	353,011
Originated one year before current year	261,119	253,957
Originated two years before current year	169,561	135,670
Originated three years before current year	82,293	97,253
Originated four years before current year	52,517	52,654
Originated more than five years before current fiscal year	29,263	21,280
Revolving	0	0
Revolving to Term	22	77
Total loans	860,785	913,902
Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	860,785	913,902
Indirect | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	265,815	352,989
Originated one year before current year	260,763	253,514
Originated two years before current year	169,061	134,893
Originated three years before current year	81,733	96,587
Originated four years before current year	52,028	52,225
Originated more than five years before current fiscal year	28,918	21,088
Revolving	0	0
Revolving to Term	22	77
Total loans	858,340	911,373
Indirect | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	195	22
Originated one year before current year	356	443
Originated two years before current year	500	777
Originated three years before current year	560	666
Originated four years before current year	489	429
Originated more than five years before current fiscal year	345	192
Revolving	0	0
Revolving to Term	0	0
Total loans	2,445	2,529
Direct
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	28,568	32,521
Originated one year before current year	19,086	29,330
Originated two years before current year	17,113	30,681
Originated three years before current year	17,840	16,246
Originated four years before current year	9,063	8,774
Originated more than five years before current fiscal year	18,695	19,991
Revolving	38,214	26,032
Revolving to Term	545	1,232
Total loans	149,124	164,807
Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	149,124	164,807
Direct | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	28,564	32,499
Originated one year before current year	19,025	29,189
Originated two years before current year	16,984	30,510
Originated three years before current year	17,674	16,182
Originated four years before current year	8,926	8,527
Originated more than five years before current fiscal year	18,004	19,465
Revolving	38,211	26,028
Revolving to Term	541	1,229
Total loans	147,929	163,629
Direct | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	4	22
Originated one year before current year	61	141
Originated two years before current year	129	171
Originated three years before current year	166	64
Originated four years before current year	137	247
Originated more than five years before current fiscal year	691	526
Revolving	3	4
Revolving to Term	4	3
Total loans	1,195	1,178
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	0	1
Originated one year before current year	0	1,034
Originated two years before current year	628	444
Originated three years before current year	449	891
Originated four years before current year	664	249
Originated more than five years before current fiscal year	498	116
Revolving	530,160	529,369
Revolving to Term	21,923	24,310
Total loans	554,322	556,414
Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	554,322	556,414
Home equity | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	0	1
Originated one year before current year	0	997
Originated two years before current year	628	444
Originated three years before current year	390	891
Originated four years before current year	568	238
Originated more than five years before current fiscal year	436	0
Revolving	529,967	529,275
Revolving to Term	18,695	20,314
Total loans	550,684	552,160
Home equity | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	0	0
Originated one year before current year	0	37
Originated two years before current year	0	0
Originated three years before current year	59	0
Originated four years before current year	96	11
Originated more than five years before current fiscal year	62	116
Revolving	193	94
Revolving to Term	3,228	3,996
Total loans	3,638	4,254
Pass | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	897,040	1,675,964
Originated one year before current year	638,945	420,736
Originated two years before current year	317,026	171,228
Originated three years before current year	125,230	227,710
Originated four years before current year	165,228	124,041
Originated more than five years before current fiscal year	245,618	262,538
Revolving	608,212	549,849
Revolving to Term	164,020	148,508
Total loans	3,161,319	3,580,574
Pass | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	1,058,090	1,537,226
Originated one year before current year	1,561,584	1,041,305
Originated two years before current year	902,806	749,102
Originated three years before current year	580,718	677,119
Originated four years before current year	558,072	496,086
Originated more than five years before current fiscal year	711,425	513,658
Revolving	22,791	28,122
Revolving to Term	430,064	382,219
Total loans	5,825,550	5,424,837
Pass | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	59,605	94,828
Originated one year before current year	77,065	73,913
Originated two years before current year	57,928	49,875
Originated three years before current year	38,168	36,288
Originated four years before current year	27,380	24,946
Originated more than five years before current fiscal year	12,867	5,327
Revolving	44,982	52,393
Revolving to Term	18,622	19,353
Total loans	336,617	356,923
Criticized | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	11,262	23,982
Originated one year before current year	8,747	9,603
Originated two years before current year	2,473	15,003
Originated three years before current year	0	9,508
Originated four years before current year	7,964	3,383
Originated more than five years before current fiscal year	2,901	5,369
Revolving	7,784	10,307
Revolving to Term	11,533	2,685
Total loans	52,664	79,840
Criticized | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	28,606	6,874
Originated one year before current year	5,243	49,271
Originated two years before current year	53,705	26,464
Originated three years before current year	34,005	46,994
Originated four years before current year	18,706	17,648
Originated more than five years before current fiscal year	23,259	33,490
Revolving	152	0
Revolving to Term	17,012	19,804
Total loans	180,688	200,545
Criticized | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	1,189	1,599
Originated one year before current year	1,381	1,403
Originated two years before current year	1,063	621
Originated three years before current year	306	414
Originated four years before current year	0	643
Originated more than five years before current fiscal year	0	0
Revolving	1,449	868
Revolving to Term	1,475	1,259
Total loans	6,863	6,807
Substandard | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	8,024	6,501
Originated one year before current year	16,399	6,369
Originated two years before current year	12,056	10,077
Originated three years before current year	11,253	9,836
Originated four years before current year	6,874	2,774
Originated more than five years before current fiscal year	5,171	8,441
Revolving	7,642	15,344
Revolving to Term	4,857	3,049
Total loans	72,276	62,391
Substandard | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	4,878	11,451
Originated one year before current year	10,254	4,700
Originated two years before current year	7,168	13,565
Originated three years before current year	7,201	26,691
Originated four years before current year	21,423	5,308
Originated more than five years before current fiscal year	13,290	8,665
Revolving	2,291	0
Revolving to Term	4,382	2,911
Total loans	70,887	73,291
Substandard | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	287	233
Originated one year before current year	61	1,417
Originated two years before current year	1,113	195
Originated three years before current year	209	246
Originated four years before current year	912	33
Originated more than five years before current fiscal year	139	0
Revolving	289	317
Revolving to Term	576	701
Total loans	3,586	3,142
Nonaccrual | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	1,096	2,600
Originated one year before current year	3,710	3,754
Originated two years before current year	1,031	4,701
Originated three years before current year	2,407	6,951
Originated four years before current year	4,019	49
Originated more than five years before current fiscal year	0	4,379
Revolving	188	778
Revolving to Term	7,994	7,013
Total loans	20,445	30,225
Nonaccrual | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	306	1,408
Originated one year before current year	2,509	2,054
Originated two years before current year	0	5,393
Originated three years before current year	1,472	9,456
Originated four years before current year	6,229	1,635
Originated more than five years before current fiscal year	10,089	12,564
Revolving	321	0
Revolving to Term	147	313
Total loans	21,073	32,823
Nonaccrual | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	0	161
Originated one year before current year	135	551
Originated two years before current year	0	134
Originated three years before current year	0	200
Originated four years before current year	230	0
Originated more than five years before current fiscal year	0	0
Revolving	0	89
Revolving to Term	1,335	1,466
Total loans	1,700	2,601
Doubtful | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	0	0
Originated one year before current year	148	0
Originated two years before current year	653	1,016
Originated three years before current year	1,296	2,748
Originated four years before current year	181	296
Originated more than five years before current fiscal year	3,811	610
Revolving	0	0
Revolving to Term	0	0
Total loans	6,089	4,670
Doubtful | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	0	0
Originated one year before current year	0	1,832
Originated two years before current year	2,021	0
Originated three years before current year	1,146	18,926
Originated four years before current year	18,201	19,283
Originated more than five years before current fiscal year	12,769	3,274
Revolving	0	0
Revolving to Term	0	0
Total loans	34,137	43,315
Doubtful | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	0	0
Originated one year before current year	0	3
Originated two years before current year	289	847
Originated three years before current year	1,418	70
Originated four years before current year	0	0
Originated more than five years before current fiscal year	214	30
Revolving	0	0
Revolving to Term	0	0
Total loans	$ 1,921	$ 950

X

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Amount excluding accrued interest, before allowance for credit loss, of financing receivable.

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No definition available.

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