Loans and Allowance for Credit Losses - Schedule of Risk Rating and Payment Performance (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 31,822,374		$ 31,123,641
Total	18,180	$ 4,664
Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	31,822,374		31,123,641
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	9,751,875		9,508,904
Total	12,423	1,880
Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
2023	703,968		2,473,145
2022	2,375,171		1,851,604
2021	1,632,967		880,723
2020	786,105		802,628
2019	684,011		382,993
Prior	714,265		423,484
Revolving	2,145,212		2,118,835
Revolving to Term	496,989		365,212
Total loans	9,538,688		9,298,624
2023	0
2022	0
2021	5,230
2020	0
2019	6,789
Prior	239
Revolving	165
Revolving to Term	0
Total	12,423
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	12,908,380		12,457,070
Total	1,189	507
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
2023	609,760		3,193,582
2022	3,279,227		2,928,035
2021	2,941,487		2,050,913
2020	1,999,624		1,384,735
2019	1,345,140		823,735
Prior	1,790,377		1,139,730
Revolving	74,982		57,818
Revolving to Term	707,742		720,200
Total loans	12,748,339		12,298,748
2023	0
2022	54
2021	735
2020	400
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	1,189
BBCC
Financing Receivable, Credit Quality Indicator [Line Items]
Total	28	28
BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
2023	25,254		92,738
2022	89,788		64,973
2021	60,449		53,229
2020	49,570		38,138
2019	36,837		24,464
Prior	28,036		11,690
Revolving	62,496		61,565
Revolving to Term	20,798		21,805
Total loans	373,228		368,602
2023	0
2022	0
2021	28
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	28
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2023	92,032		1,327,227
2022	1,421,008		1,946,321
2021	1,978,182		1,826,623
2020	1,751,769		479,402
2019	475,343		138,086
Prior	850,242		742,687
Revolving	0		7
Revolving to Term	90		88
Total loans	6,568,666		6,460,441
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	23
Revolving	0
Revolving to Term	0
Total	23	185
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,568,666		6,460,441
Residential real estate | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2023	92,032		1,327,168
2022	1,419,736		1,945,792
2021	1,975,809		1,825,762
2020	1,749,348		478,529
2019	472,547		136,260
Prior	823,622		712,175
Revolving	0		7
Revolving to Term	84		88
Total loans	6,533,178		6,425,781
Residential real estate | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0		59
2022	1,272		529
2021	2,373		861
2020	2,421		873
2019	2,796		1,826
Prior	26,620		30,512
Revolving	0		0
Revolving to Term	6		0
Total loans	35,488		34,660
Indirect
Financing Receivable, Credit Quality Indicator [Line Items]
2023	74,980		504,758
2022	466,310		250,481
2021	226,663		144,910
2020	127,415		82,835
2019	69,614		31,788
Prior	38,247		19,423
Revolving	0		0
Revolving to Term	58		62
Total loans	1,003,287		1,034,257
2023	0
2022	514
2021	430
2020	93
2019	111
Prior	49
Revolving	0
Revolving to Term	0
Total	1,197	483
Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,003,287		1,034,257
Indirect | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2023	74,980		504,410
2022	465,805		249,407
2021	225,377		144,265
2020	126,788		82,304
2019	69,147		31,484
Prior	37,704		19,095
Revolving	0		0
Revolving to Term	58		62
Total loans	999,859		1,031,027
Indirect | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0		348
2022	505		1,074
2021	1,286		645
2020	627		531
2019	467		304
Prior	543		328
Revolving	0		0
Revolving to Term	0		0
Total loans	3,428		3,230
Direct
Financing Receivable, Credit Quality Indicator [Line Items]
2023	27,097		133,049
2022	121,926		164,977
2021	142,300		78,020
2020	68,987		58,124
2019	49,617		45,626
Prior	94,148		60,738
Revolving	74,527		87,627
Revolving to Term	2,124		1,025
Total loans	580,726		629,186
2023	0
2022	471
2021	794
2020	286
2019	327
Prior	195
Revolving	1,165
Revolving to Term	0
Total	3,238	1,530
Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	580,726		629,186
Direct | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2023	27,097		132,934
2022	121,525		164,126
2021	141,746		77,406
2020	68,407		57,919
2019	48,981		45,299
Prior	92,285		59,212
Revolving	74,520		87,622
Revolving to Term	2,118		671
Total loans	576,679		625,189
Direct | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0		115
2022	401		851
2021	554		614
2020	580		205
2019	636		327
Prior	1,863		1,526
Revolving	7		5
Revolving to Term	6		354
Total loans	4,047		3,997
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0		1,085
2022	1,435		1,056
2021	1,009		2,015
2020	1,543		1,943
2019	1,998		1,777
Prior	13,408		15,954
Revolving	964,835		991,699
Revolving to Term	25,212		18,254
Total loans	1,009,440		1,033,783
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	82
Revolving	0
Revolving to Term	0
Total	82	$ 51
Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,009,440		1,033,783
Home equity | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0		919
2022	1,273		896
2021	876		1,849
2020	1,382		1,497
2019	1,068		983
Prior	7,938		11,646
Revolving	962,911		990,001
Revolving to Term	20,456		14,792
Total loans	995,904		1,022,583
Home equity | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0		166
2022	162		160
2021	133		166
2020	161		446
2019	930		794
Prior	5,470		4,308
Revolving	1,924		1,698
Revolving to Term	4,756		3,462
Total loans	13,536		11,200
Pass | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
2023	673,613		2,388,618
2022	2,299,378		1,754,364
2021	1,517,883		796,340
2020	712,011		738,208
2019	629,196		362,986
Prior	694,970		388,617
Revolving	2,041,109		1,988,763
Revolving to Term	433,838		329,119
Total loans	9,001,998		8,747,015
Pass | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
2023	600,890		3,066,960
2022	3,129,239		2,828,758
2021	2,833,471		1,989,000
2020	1,942,417		1,219,025
2019	1,171,555		675,572
Prior	1,560,183		1,018,719
Revolving	74,982		57,818
Revolving to Term	643,987		689,553
Total loans	11,956,724		11,545,405
Pass | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
2023	25,194		90,341
2022	86,881		64,161
2021	59,220		52,304
2020	48,866		36,868
2019	35,291		23,618
Prior	27,217		11,333
Revolving	59,846		60,016
Revolving to Term	17,644		18,881
Total loans	360,159		357,522
Criticized | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
2023	24,476		40,856
2022	38,369		30,661
2021	26,289		63,557
2020	52,907		33,490
2019	31,378		9,195
Prior	6,538		5,312
Revolving	56,784		61,036
Revolving to Term	10,792		4,327
Total loans	247,533		248,434
Criticized | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
2023	217		75,306
2022	56,997		34,422
2021	40,407		22,569
2020	22,202		82,637
2019	70,931		86,504
Prior	105,130		56,864
Revolving	0		0
Revolving to Term	42,466		23,282
Total loans	338,350		381,584
Criticized | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
2023	50		1,504
2022	1,843		525
2021	479		368
2020	265		692
2019	1,023		353
Prior	57		0
Revolving	2,047		1,006
Revolving to Term	1,660		1,603
Total loans	7,424		6,051
Substandard | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
2023	5,879		37,223
2022	16,596		47,522
2021	75,646		16,540
2020	15,505		22,925
2019	21,896		4,844
Prior	3,401		21,204
Revolving	40,883		67,402
Revolving to Term	47,187		25,143
Total loans	226,993		242,803
Substandard | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
2023	8,653		46,231
2022	89,716		16,928
2021	22,101		24,319
2020	20,207		78,468
2019	98,147		57,824
Prior	82,928		21,591
Revolving	0		0
Revolving to Term	18,138		4,108
Total loans	339,890		249,469
Substandard | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
2023	10		811
2022	986		143
2021	641		0
2020	33		421
2019	415		0
Prior	0		0
Revolving	603		543
Revolving to Term	658		682
Total loans	3,346		2,600
Nonaccrual | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0		3,627
2022	0		1,453
2021	1,462		566
2020	2,049		0
2019	1,468		0
Prior	0		0
Revolving	6,436		1,634
Revolving to Term	5,172		6,623
Total loans	16,587		13,903
Nonaccrual | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0		3,151
2022	648		9,541
2021	9,785		5,014
2020	4,879		0
2019	0		2,312
Prior	21,708		22,155
Revolving	0		0
Revolving to Term	3,151		3,257
Total loans	40,171		45,430
Nonaccrual | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0		42
2022	39		37
2021	36		118
2020	130		0
2019	0		429
Prior	626		284
Revolving	0		0
Revolving to Term	836		639
Total loans	1,667		1,549
Doubtful | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0		2,821
2022	20,828		17,604
2021	11,687		3,720
2020	3,633		8,005
2019	73		5,968
Prior	9,356		8,351
Revolving	0		0
Revolving to Term	0		0
Total loans	45,577		46,469
Doubtful | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0		1,934
2022	2,627		38,386
2021	35,723		10,011
2020	9,919		4,605
2019	4,507		1,523
Prior	20,428		20,401
Revolving	0		0
Revolving to Term	0		0
Total loans	73,204		76,860
Doubtful | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0		40
2022	39		107
2021	73		439
2020	276		157
2019	108		64
Prior	136		73
Revolving	0		0
Revolving to Term	0		0
Total loans	$ 632		$ 880