Loans and Allowance for Credit Losses - Schedule of Risk Rating and Payment Performance (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 28,336,244	$ 13,601,846
Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	28,336,244	13,601,846
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	8,624,253	3,391,769
Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	559,140	944,296
Originated one year before current year	2,081,084	589,907
Originated two years before current year	1,164,588	289,294
Originated three years before current year	1,096,037	112,326
Originated four years before current year	514,998	171,251
Originated more than five years before current fiscal year	699,185	244,517
Revolving	2,151,379	689,957
Revolving to Term	168,262	158,664
Total loans	8,434,673	3,200,212
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	11,337,735	6,380,674
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	694,077	1,596,481
Originated one year before current year	2,944,906	1,514,176
Originated two years before current year	2,309,678	898,738
Originated three years before current year	1,662,093	492,535
Originated four years before current year	1,089,150	516,592
Originated more than five years before current fiscal year	1,839,460	666,606
Revolving	120,593	45,215
Revolving to Term	523,045	491,141
Total loans	11,183,002	6,221,484
BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	21,519	83,314
Originated one year before current year	79,601	71,056
Originated two years before current year	65,956	55,784
Originated three years before current year	51,027	36,019
Originated four years before current year	31,553	25,366
Originated more than five years before current fiscal year	26,877	9,133
Revolving	45,884	48,344
Revolving to Term	21,896	21,731
Total loans	344,313	350,747
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	261,002	625,678
Originated one year before current year	1,923,890	632,870
Originated two years before current year	1,944,084	272,766
Originated three years before current year	537,009	73,116
Originated four years before current year	155,272	104,721
Originated more than five years before current fiscal year	877,459	546,021
Revolving	7,338	12
Revolving to Term	101	105
Total loans	5,706,155	2,255,289
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,706,155	2,255,289
Residential real estate | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	261,002	625,582
Originated one year before current year	1,923,614	632,705
Originated two years before current year	1,943,517	272,600
Originated three years before current year	536,379	72,766
Originated four years before current year	153,889	103,866
Originated more than five years before current fiscal year	848,879	529,293
Revolving	7,338	12
Revolving to Term	101	105
Total loans	5,674,719	2,236,929
Residential real estate | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	0	96
Originated one year before current year	276	165
Originated two years before current year	567	166
Originated three years before current year	630	350
Originated four years before current year	1,383	855
Originated more than five years before current fiscal year	28,580	16,728
Revolving	0	0
Revolving to Term	0	0
Total loans	31,436	18,360
Indirect
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	132,303	361,747
Originated one year before current year	337,001	231,680
Originated two years before current year	205,527	147,592
Originated three years before current year	127,278	69,023
Originated four years before current year	56,892	42,028
Originated more than five years before current fiscal year	47,523	21,060
Revolving	0	0
Revolving to Term	2	9
Total loans	906,526	873,139
Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	906,526	873,139
Indirect | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	132,303	361,485
Originated one year before current year	336,662	231,156
Originated two years before current year	205,006	146,978
Originated three years before current year	126,786	68,513
Originated four years before current year	56,493	41,598
Originated more than five years before current fiscal year	46,887	20,819
Revolving	0	0
Revolving to Term	2	9
Total loans	904,139	870,558
Indirect | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	0	262
Originated one year before current year	339	524
Originated two years before current year	521	614
Originated three years before current year	492	510
Originated four years before current year	399	430
Originated more than five years before current fiscal year	636	241
Revolving	0	0
Revolving to Term	0	0
Total loans	2,387	2,581
Direct
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	51,785	34,071
Originated one year before current year	209,074	16,188
Originated two years before current year	110,264	14,526
Originated three years before current year	92,104	14,712
Originated four years before current year	67,834	7,467
Originated more than five years before current fiscal year	58,149	16,367
Revolving	91,434	36,854
Revolving to Term	46	200
Total loans	680,690	140,385
Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	680,690	140,385
Direct | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	51,785	34,058
Originated one year before current year	208,885	16,135
Originated two years before current year	110,180	14,396
Originated three years before current year	91,848	14,579
Originated four years before current year	67,637	7,432
Originated more than five years before current fiscal year	57,716	15,831
Revolving	91,394	36,812
Revolving to Term	42	192
Total loans	679,487	139,435
Direct | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	0	13
Originated one year before current year	189	53
Originated two years before current year	84	130
Originated three years before current year	256	133
Originated four years before current year	197	35
Originated more than five years before current fiscal year	433	536
Revolving	40	42
Revolving to Term	4	8
Total loans	1,203	950
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	4,319	0
Originated one year before current year	12,708	0
Originated two years before current year	8,486	649
Originated three years before current year	18,107	358
Originated four years before current year	15,677	576
Originated more than five years before current fiscal year	54,175	1
Revolving	947,743	539,315
Revolving to Term	19,670	19,691
Total loans	1,080,885	560,590
Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,080,885	560,590
Home equity | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	4,106	0
Originated one year before current year	12,367	0
Originated two years before current year	8,145	633
Originated three years before current year	17,441	349
Originated four years before current year	14,323	535
Originated more than five years before current fiscal year	47,692	0
Revolving	947,382	539,057
Revolving to Term	16,663	16,768
Total loans	1,068,119	557,342
Home equity | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	213	0
Originated one year before current year	341	0
Originated two years before current year	341	16
Originated three years before current year	666	9
Originated four years before current year	1,354	41
Originated more than five years before current fiscal year	6,483	1
Revolving	361	258
Revolving to Term	3,007	2,923
Total loans	12,766	3,248
Pass | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	529,094	918,456
Originated one year before current year	2,006,908	563,869
Originated two years before current year	1,118,822	271,158
Originated three years before current year	1,010,657	98,468
Originated four years before current year	464,275	156,136
Originated more than five years before current fiscal year	653,504	235,639
Revolving	2,047,370	667,628
Revolving to Term	140,617	130,470
Total loans	7,971,247	3,041,824
Pass | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	650,646	1,555,880
Originated one year before current year	2,778,302	1,474,271
Originated two years before current year	2,236,175	846,921
Originated three years before current year	1,553,009	481,508
Originated four years before current year	958,205	462,176
Originated more than five years before current fiscal year	1,672,138	611,680
Revolving	117,993	42,609
Revolving to Term	483,920	451,544
Total loans	10,450,388	5,926,589
Pass | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	21,151	81,710
Originated one year before current year	77,808	69,749
Originated two years before current year	64,413	54,580
Originated three years before current year	49,309	34,461
Originated four years before current year	30,895	25,113
Originated more than five years before current fiscal year	26,428	8,296
Revolving	45,160	47,571
Revolving to Term	19,025	18,778
Total loans	334,189	340,258
Criticized | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	4,190	9,998
Originated one year before current year	26,183	7,885
Originated two years before current year	17,198	6,660
Originated three years before current year	32,638	0
Originated four years before current year	18,458	7,809
Originated more than five years before current fiscal year	20,190	2,658
Revolving	68,124	14,601
Revolving to Term	1,955	10,076
Total loans	188,936	59,687
Criticized | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	36,934	27,622
Originated one year before current year	49,341	24,790
Originated two years before current year	35,471	39,914
Originated three years before current year	56,892	0
Originated four years before current year	59,254	21,614
Originated more than five years before current fiscal year	40,428	22,157
Revolving	0	0
Revolving to Term	34,058	34,387
Total loans	312,378	170,484
Criticized | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	343	1,320
Originated one year before current year	1,493	1,170
Originated two years before current year	1,315	841
Originated three years before current year	777	160
Originated four years before current year	207	0
Originated more than five years before current fiscal year	0	0
Revolving	488	670
Revolving to Term	1,752	1,578
Total loans	6,375	5,739
Substandard | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	25,856	14,773
Originated one year before current year	43,839	14,468
Originated two years before current year	22,160	10,200
Originated three years before current year	48,825	9,849
Originated four years before current year	28,063	5,521
Originated more than five years before current fiscal year	12,127	945
Revolving	28,989	6,883
Revolving to Term	19,315	10,322
Total loans	229,174	72,961
Substandard | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	6,497	4,706
Originated one year before current year	67,687	12,118
Originated two years before current year	28,372	9,933
Originated three years before current year	50,652	9,058
Originated four years before current year	62,504	18,165
Originated more than five years before current fiscal year	65,373	11,351
Revolving	2,291	2,291
Revolving to Term	4,258	4,339
Total loans	287,634	71,961
Substandard | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	25	284
Originated one year before current year	280	24
Originated two years before current year	0	79
Originated three years before current year	546	7
Originated four years before current year	16	187
Originated more than five years before current fiscal year	161	465
Revolving	236	103
Revolving to Term	270	239
Total loans	1,534	1,388
Nonaccrual | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	0	1,069
Originated one year before current year	2,416	3,507
Originated two years before current year	4,280	1,276
Originated three years before current year	3,039	3,721
Originated four years before current year	1,244	1,448
Originated more than five years before current fiscal year	9,599	0
Revolving	3,233	845
Revolving to Term	6,375	7,796
Total loans	30,186	19,662
Nonaccrual | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	0	1,620
Originated one year before current year	8,197	2,997
Originated two years before current year	4,842	0
Originated three years before current year	(1)	1,627
Originated four years before current year	1,393	3,419
Originated more than five years before current fiscal year	10,661	8,905
Revolving	309	315
Revolving to Term	809	871
Total loans	26,210	19,754
Nonaccrual | 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	20	88
Originated two years before current year	203	0
Originated three years before current year	0	0
Originated four years before current year	71	66
Originated more than five years before current fiscal year	0	162
Revolving	0	0
Revolving to Term	849	1,136
Total loans	1,143	1,452
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	1,738	178
Originated two years before current year	2,128	0
Originated three years before current year	878	288
Originated four years before current year	2,958	337
Originated more than five years before current fiscal year	3,765	5,275
Revolving	3,663	0
Revolving to Term	0	0
Total loans	15,130	6,078
Doubtful | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	0	6,653
Originated one year before current year	41,379	0
Originated two years before current year	4,818	1,970
Originated three years before current year	1,541	342
Originated four years before current year	7,794	11,218
Originated more than five years before current fiscal year	50,860	12,513
Revolving	0	0
Revolving to Term	0	0
Total loans	106,392	32,696
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	25
Originated two years before current year	25	284
Originated three years before current year	395	1,391
Originated four years before current year	364	0
Originated more than five years before current fiscal year	288	210
Revolving	0	0
Revolving to Term	0	0
Total loans	$ 1,072	$ 1,910