Loans and Allowance for Credit Losses - Loan Balances by Year of Origination and Performing and Nonperforming Status (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	$ 217,628	$ 1,271,764
Year two	1,274,343	1,214,107
Year three	1,192,510	586,544
Year four	561,326	725,517
Year five	710,480	449,759
More than five years	1,898,077	1,528,088
Revolving	1,370,146	1,381,517
Revolving-Term	26,554	26,673
Total	7,251,064	7,183,969
Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	217,628	1,271,764
Year two	1,274,170	1,213,905
Year three	1,192,365	585,892
Year four	561,096	724,629
Year five	709,654	448,121
More than five years	1,880,304	1,513,912
Revolving	1,365,672	1,380,980
Revolving-Term	25,531	25,714
Total	7,226,420	7,164,917
Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	173	202
Year three	145	652
Year four	230	888
Year five	826	1,638
More than five years	17,773	14,176
Revolving	4,474	537
Revolving-Term	1,023	959
Total	24,644	19,052
Commercial Loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	59,710	292,732
Year two	264,611	360,423
Year three	379,447	269,049
Year four	260,669	449,493
Year five	447,544	261,941
More than five years	1,090,170	883,535
Revolving	21,283	21,666
Revolving-Term	0	0
Total	2,523,434	2,538,839
Commercial Loans | Commercial real estate | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	59,710	292,732
Year two	264,611	360,423
Year three	379,447	269,049
Year four	260,669	449,493
Year five	447,544	261,941
More than five years	1,082,745	876,435
Revolving	21,283	21,666
Revolving-Term	0	0
Total	2,516,009	2,531,739
Commercial Loans | Commercial real estate | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
More than five years	7,425	7,100
Revolving	0	0
Revolving-Term	0	0
Total	7,425	7,100
Commercial Loans | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	27,936	253,696
Year two	254,391	289,448
Year three	266,690	88,544
Year four	84,058	73,998
Year five	68,548	65,911
More than five years	206,540	147,273
Revolving	585,356	591,522
Revolving-Term	0	0
Total	1,493,519	1,510,392
Commercial Loans | Commercial and industrial | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	27,936	253,696
Year two	254,391	289,448
Year three	266,690	88,544
Year four	84,058	73,998
Year five	68,548	65,858
More than five years	203,695	147,273
Revolving	581,126	591,292
Revolving-Term	0	0
Total	1,486,444	1,510,109
Commercial Loans | Commercial and industrial | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	53
More than five years	2,845	0
Revolving	4,230	230
Revolving-Term	0	0
Total	7,075	283
Commercial Loans | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	5,249	120,655
Year two	142,639	170,691
Year three	159,422	40,762
Year four	25,115	14,442
Year five	11,856	3,953
More than five years	6,589	4,176
Revolving	25,985	27,284
Revolving-Term	0	0
Total	376,855	381,963
Commercial Loans | Commercial construction | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	5,249	120,655
Year two	142,639	170,691
Year three	159,422	40,762
Year four	25,115	14,442
Year five	11,856	3,953
More than five years	6,205	3,792
Revolving	25,985	27,284
Revolving-Term	0	0
Total	376,471	381,579
Commercial Loans | Commercial construction | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
More than five years	384	384
Revolving	0	0
Revolving-Term	0	0
Total	384	384
Commercial Loans | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	68,827	287,679
Year two	282,559	233,723
Year three	230,679	91,149
Year four	95,954	109,731
Year five	107,457	84,889
More than five years	369,624	292,211
Revolving	105,467	105,271
Revolving-Term	1,275	1,291
Total	1,261,842	1,205,944
Commercial Loans | Business banking | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	68,827	287,679
Year two	282,559	233,656
Year three	230,679	91,149
Year four	95,938	109,479
Year five	107,271	83,689
More than five years	366,007	289,435
Revolving	105,467	105,172
Revolving-Term	1,179	1,195
Total	1,257,927	1,201,454
Commercial Loans | Business banking | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	67
Year three	0	0
Year four	16	252
Year five	186	1,200
More than five years	3,617	2,776
Revolving	0	99
Revolving-Term	96	96
Total	3,915	4,490
Consumer Loans | Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	51,356	296,948
Year two	313,616	149,003
Year three	146,669	91,613
Year four	90,738	74,583
Year five	72,474	32,031
More than five years	223,812	200,169
Revolving	553,379	553,649
Revolving-Term	23,531	23,957
Total	1,475,575	1,421,953
Consumer Loans | Consumer real estate | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	51,356	296,948
Year two	313,451	148,868
Year three	146,543	91,085
Year four	90,682	73,947
Year five	71,834	31,646
More than five years	220,441	196,384
Revolving	553,135	553,441
Revolving-Term	22,604	23,108
Total	1,470,046	1,415,427
Consumer Loans | Consumer real estate | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	165	135
Year three	126	528
Year four	56	636
Year five	640	385
More than five years	3,371	3,785
Revolving	244	208
Revolving-Term	927	849
Total	5,529	6,526
Consumer Loans | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	4,550	20,054
Year two	16,527	10,819
Year three	9,603	5,427
Year four	4,792	3,270
Year five	2,601	1,034
More than five years	1,342	724
Revolving	78,676	82,125
Revolving-Term	1,748	1,425
Total	119,839	124,878
Consumer Loans | Other consumer | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	4,550	20,054
Year two	16,519	10,819
Year three	9,584	5,303
Year four	4,634	3,270
Year five	2,601	1,034
More than five years	1,211	593
Revolving	78,676	82,125
Revolving-Term	1,748	1,411
Total	119,523	124,609
Consumer Loans | Other consumer | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	8	0
Year three	19	124
Year four	158	0
Year five	0	0
More than five years	131	131
Revolving	0	0
Revolving-Term	0	14
Total	$ 316	$ 269