Loans and Allowance for Credit Losses - Schedule of Risk Rating and Payment Performance (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 30,528,933	$ 13,601,846
Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	30,528,933	13,601,846
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	9,311,148	3,391,769
Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	1,875,354	944,296
Originated one year before current year	2,025,879	589,907
Originated two years before current year	995,210	289,294
Originated three years before current year	925,112	112,326
Originated four years before current year	411,547	171,251
Originated more than five years before current fiscal year	481,783	244,517
Revolving	2,083,367	689,957
Revolving to Term	315,727	158,664
Total loans	9,113,979	3,200,212
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	12,227,888	6,380,674
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	2,493,631	1,596,481
Originated one year before current year	2,966,864	1,514,176
Originated two years before current year	2,204,825	898,738
Originated three years before current year	1,462,847	492,535
Originated four years before current year	931,827	516,592
Originated more than five years before current fiscal year	1,333,979	666,606
Revolving	54,845	45,215
Revolving to Term	625,286	491,141
Total loans	12,074,104	6,221,484
BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	64,756	83,314
Originated one year before current year	71,340	71,056
Originated two years before current year	57,416	55,784
Originated three years before current year	42,054	36,019
Originated four years before current year	27,055	25,366
Originated more than five years before current fiscal year	15,495	9,133
Revolving	51,958	48,344
Revolving to Term	20,879	21,731
Total loans	350,953	350,747
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	1,070,939	625,678
Originated one year before current year	1,920,431	632,870
Originated two years before current year	1,862,658	272,766
Originated three years before current year	496,646	73,116
Originated four years before current year	145,117	104,721
Originated more than five years before current fiscal year	771,415	546,021
Revolving	8	12
Revolving to Term	92	105
Total loans	6,267,306	2,255,289
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,267,306	2,255,289
Residential real estate | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	1,070,939	625,582
Originated one year before current year	1,920,008	632,705
Originated two years before current year	1,861,893	272,600
Originated three years before current year	496,062	72,766
Originated four years before current year	144,400	103,866
Originated more than five years before current fiscal year	742,078	529,293
Revolving	8	12
Revolving to Term	92	105
Total loans	6,235,480	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	423	165
Originated two years before current year	765	166
Originated three years before current year	584	350
Originated four years before current year	717	855
Originated more than five years before current fiscal year	29,337	16,728
Revolving	0	0
Revolving to Term	0	0
Total loans	31,826	18,360
Indirect
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	404,257	361,747
Originated one year before current year	275,010	231,680
Originated two years before current year	162,769	147,592
Originated three years before current year	95,974	69,023
Originated four years before current year	39,562	42,028
Originated more than five years before current fiscal year	26,437	21,060
Revolving	0	0
Revolving to Term	45	9
Total loans	1,004,054	873,139
Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,004,054	873,139
Indirect | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	404,054	361,485
Originated one year before current year	274,254	231,156
Originated two years before current year	162,221	146,978
Originated three years before current year	95,443	68,513
Originated four years before current year	39,202	41,598
Originated more than five years before current fiscal year	25,995	20,819
Revolving	0	0
Revolving to Term	45	9
Total loans	1,001,214	870,558
Indirect | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	203	262
Originated one year before current year	756	524
Originated two years before current year	548	614
Originated three years before current year	531	510
Originated four years before current year	360	430
Originated more than five years before current fiscal year	442	241
Revolving	0	0
Revolving to Term	0	0
Total loans	2,840	2,581
Direct
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	121,121	34,071
Originated one year before current year	186,086	16,188
Originated two years before current year	87,449	14,526
Originated three years before current year	67,866	14,712
Originated four years before current year	52,972	7,467
Originated more than five years before current fiscal year	68,072	16,367
Revolving	89,715	36,854
Revolving to Term	1,662	200
Total loans	674,943	140,385
Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	674,943	140,385
Direct | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	120,960	34,058
Originated one year before current year	185,466	16,135
Originated two years before current year	86,802	14,396
Originated three years before current year	67,478	14,579
Originated four years before current year	52,671	7,432
Originated more than five years before current fiscal year	65,437	15,831
Revolving	89,675	36,812
Revolving to Term	1,530	192
Total loans	670,019	139,435
Direct | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	161	13
Originated one year before current year	620	53
Originated two years before current year	647	130
Originated three years before current year	388	133
Originated four years before current year	301	35
Originated more than five years before current fiscal year	2,635	536
Revolving	40	42
Revolving to Term	132	8
Total loans	4,924	950
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	965	0
Originated one year before current year	1,088	0
Originated two years before current year	2,094	649
Originated three years before current year	2,763	358
Originated four years before current year	1,832	576
Originated more than five years before current fiscal year	15,506	1
Revolving	1,000,737	539,315
Revolving to Term	18,609	19,691
Total loans	1,043,594	560,590
Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,043,594	560,590
Home equity | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	741	0
Originated one year before current year	992	0
Originated two years before current year	1,863	633
Originated three years before current year	2,035	349
Originated four years before current year	1,008	535
Originated more than five years before current fiscal year	11,171	0
Revolving	999,869	539,057
Revolving to Term	15,370	16,768
Total loans	1,033,049	557,342
Home equity | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	224	0
Originated one year before current year	96	0
Originated two years before current year	231	16
Originated three years before current year	728	9
Originated four years before current year	824	41
Originated more than five years before current fiscal year	4,335	1
Revolving	868	258
Revolving to Term	3,239	2,923
Total loans	10,545	3,248
Pass | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	1,788,480	918,456
Originated one year before current year	1,953,811	563,869
Originated two years before current year	928,908	271,158
Originated three years before current year	858,442	98,468
Originated four years before current year	386,870	156,136
Originated more than five years before current fiscal year	444,404	235,639
Revolving	1,981,798	667,628
Revolving to Term	277,119	130,470
Total loans	8,619,832	3,041,824
Pass | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	2,375,092	1,555,880
Originated one year before current year	2,864,028	1,474,271
Originated two years before current year	2,141,691	846,921
Originated three years before current year	1,322,839	481,508
Originated four years before current year	803,056	462,176
Originated more than five years before current fiscal year	1,209,592	611,680
Revolving	54,548	42,609
Revolving to Term	597,665	451,544
Total loans	11,368,511	5,926,589
Pass | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	63,023	81,710
Originated one year before current year	70,355	69,749
Originated two years before current year	56,446	54,580
Originated three years before current year	40,627	34,461
Originated four years before current year	26,382	25,113
Originated more than five years before current fiscal year	14,995	8,296
Revolving	50,146	47,571
Revolving to Term	18,477	18,778
Total loans	340,451	340,258
Criticized | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	42,688	9,998
Originated one year before current year	27,736	7,885
Originated two years before current year	41,026	6,660
Originated three years before current year	44,508	0
Originated four years before current year	10,165	7,809
Originated more than five years before current fiscal year	6,293	2,658
Revolving	61,764	14,601
Revolving to Term	4,397	10,076
Total loans	238,577	59,687
Criticized | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	61,754	27,622
Originated one year before current year	28,671	24,790
Originated two years before current year	21,462	39,914
Originated three years before current year	60,599	0
Originated four years before current year	68,301	21,614
Originated more than five years before current fiscal year	44,349	22,157
Revolving	0	0
Revolving to Term	20,431	34,387
Total loans	305,567	170,484
Criticized | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	1,330	1,320
Originated one year before current year	633	1,170
Originated two years before current year	611	841
Originated three years before current year	697	160
Originated four years before current year	263	0
Originated more than five years before current fiscal year	164	0
Revolving	975	670
Revolving to Term	1,177	1,578
Total loans	5,850	5,739
Substandard | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	40,035	14,773
Originated one year before current year	35,516	14,468
Originated two years before current year	20,640	10,200
Originated three years before current year	13,877	9,849
Originated four years before current year	8,661	5,521
Originated more than five years before current fiscal year	21,806	945
Revolving	31,913	6,883
Revolving to Term	26,566	10,322
Total loans	199,014	72,961
Substandard | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	54,427	4,706
Originated one year before current year	24,635	12,118
Originated two years before current year	26,280	9,933
Originated three years before current year	78,029	9,058
Originated four years before current year	56,499	18,165
Originated more than five years before current fiscal year	31,336	11,351
Revolving	0	2,291
Revolving to Term	4,153	4,339
Total loans	275,359	71,961
Substandard | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	342	284
Originated one year before current year	324	24
Originated two years before current year	3	79
Originated three years before current year	343	7
Originated four years before current year	0	187
Originated more than five years before current fiscal year	0	465
Revolving	837	103
Revolving to Term	502	239
Total loans	2,351	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	2,158	3,507
Originated two years before current year	1,356	1,276
Originated three years before current year	1,127	3,721
Originated four years before current year	0	1,448
Originated more than five years before current fiscal year	0	0
Revolving	7,892	845
Revolving to Term	7,645	7,796
Total loans	20,178	19,662
Nonaccrual | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	2,358	1,620
Originated one year before current year	13,949	2,997
Originated two years before current year	5,640	0
Originated three years before current year	1,162	1,627
Originated four years before current year	2,188	3,419
Originated more than five years before current fiscal year	26,480	8,905
Revolving	297	315
Revolving to Term	3,037	871
Total loans	55,111	19,754
Nonaccrual | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	61	0
Originated one year before current year	0	88
Originated two years before current year	340	0
Originated three years before current year	294	0
Originated four years before current year	283	66
Originated more than five years before current fiscal year	336	162
Revolving	0	0
Revolving to Term	723	1,136
Total loans	2,037	1,452
Doubtful | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	4,151	0
Originated one year before current year	6,658	178
Originated two years before current year	3,280	0
Originated three years before current year	7,158	288
Originated four years before current year	5,851	337
Originated more than five years before current fiscal year	9,280	5,275
Revolving	0	0
Revolving to Term	0	0
Total loans	36,378	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	35,581	0
Originated two years before current year	9,752	1,970
Originated three years before current year	218	342
Originated four years before current year	1,783	11,218
Originated more than five years before current fiscal year	22,222	12,513
Revolving	0	0
Revolving to Term	0	0
Total loans	69,556	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	28	25
Originated two years before current year	16	284
Originated three years before current year	93	1,391
Originated four years before current year	127	0
Originated more than five years before current fiscal year	0	210
Revolving	0	0
Revolving to Term	0	0
Total loans	$ 264	$ 1,910