Loans and Allowance for Credit Losses - Loan Balances by Year of Origination and Performing and Nonperforming Status (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	$ 582,399	$ 1,271,764
Year two	1,276,537	1,214,107
Year three	1,137,286	586,544
Year four	536,735	725,517
Year five	685,239	449,759
More than five years	1,781,601	1,528,088
Revolving	1,292,288	1,381,517
Revolving-Term	27,526	26,673
Total	7,319,611	7,183,969
Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	582,399	1,271,764
Year two	1,276,343	1,213,905
Year three	1,137,115	585,892
Year four	536,386	724,629
Year five	684,428	448,121
More than five years	1,773,169	1,513,912
Revolving	1,289,593	1,380,980
Revolving-Term	25,859	25,714
Total	7,305,292	7,164,917
Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	194	202
Year three	171	652
Year four	349	888
Year five	811	1,638
More than five years	8,432	14,176
Revolving	2,695	537
Revolving-Term	1,667	959
Total	14,319	19,052
Commercial Loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	165,422	292,732
Year two	260,914	360,423
Year three	407,499	269,049
Year four	256,393	449,493
Year five	436,109	261,941
More than five years	1,028,519	883,535
Revolving	27,406	21,666
Revolving-Term	0	0
Total	2,582,262	2,538,839
Commercial Loans | Commercial real estate | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	165,422	292,732
Year two	260,914	360,423
Year three	407,499	269,049
Year four	256,393	449,493
Year five	436,109	261,941
More than five years	1,027,191	876,435
Revolving	27,406	21,666
Revolving-Term	0	0
Total	2,580,934	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	1,328	7,100
Revolving	0	0
Revolving-Term	0	0
Total	1,328	7,100
Commercial Loans | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	105,455	253,696
Year two	244,608	289,448
Year three	237,604	88,544
Year four	68,605	73,998
Year five	63,915	65,911
More than five years	184,219	147,273
Revolving	521,077	591,522
Revolving-Term	0	0
Total	1,425,483	1,510,392
Commercial Loans | Commercial and industrial | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	105,455	253,696
Year two	244,608	289,448
Year three	237,604	88,544
Year four	68,605	73,998
Year five	63,915	65,858
More than five years	183,887	147,273
Revolving	518,757	591,292
Revolving-Term	0	0
Total	1,422,831	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	332	0
Revolving	2,320	230
Revolving-Term	0	0
Total	2,652	283
Commercial Loans | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	31,718	120,655
Year two	161,284	170,691
Year three	111,178	40,762
Year four	12,574	14,442
Year five	11,053	3,953
More than five years	6,383	4,176
Revolving	15,653	27,284
Revolving-Term	0	0
Total	349,843	381,963
Commercial Loans | Commercial construction | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	31,718	120,655
Year two	161,284	170,691
Year three	111,178	40,762
Year four	12,574	14,442
Year five	11,053	3,953
More than five years	5,999	3,792
Revolving	15,653	27,284
Revolving-Term	0	0
Total	349,459	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	148,334	287,679
Year two	274,376	233,723
Year three	222,017	91,149
Year four	92,425	109,731
Year five	102,393	84,889
More than five years	348,461	292,211
Revolving	101,469	105,271
Revolving-Term	1,396	1,291
Total	1,290,871	1,205,944
Commercial Loans | Business banking | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	148,334	287,679
Year two	274,376	233,656
Year three	222,017	91,149
Year four	92,323	109,479
Year five	102,218	83,689
More than five years	345,330	289,435
Revolving	101,469	105,172
Revolving-Term	1,275	1,195
Total	1,287,342	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	102	252
Year five	175	1,200
More than five years	3,131	2,776
Revolving	0	99
Revolving-Term	121	96
Total	3,529	4,490
Consumer Loans | Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	124,142	296,948
Year two	320,303	149,003
Year three	150,469	91,613
Year four	102,621	74,583
Year five	69,752	32,031
More than five years	212,967	200,169
Revolving	551,017	553,649
Revolving-Term	24,250	23,957
Total	1,555,521	1,421,953
Consumer Loans | Consumer real estate | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	124,142	296,948
Year two	320,139	148,868
Year three	150,305	91,085
Year four	102,567	73,947
Year five	69,116	31,646
More than five years	209,841	196,384
Revolving	550,642	553,441
Revolving-Term	22,710	23,108
Total	1,549,462	1,415,427
Consumer Loans | Consumer real estate | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	164	135
Year three	164	528
Year four	54	636
Year five	636	385
More than five years	3,126	3,785
Revolving	375	208
Revolving-Term	1,540	849
Total	6,059	6,526
Consumer Loans | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	7,328	20,054
Year two	15,052	10,819
Year three	8,519	5,427
Year four	4,117	3,270
Year five	2,017	1,034
More than five years	1,052	724
Revolving	75,666	82,125
Revolving-Term	1,880	1,425
Total	115,631	124,878
Consumer Loans | Other consumer | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	7,328	20,054
Year two	15,022	10,819
Year three	8,512	5,303
Year four	3,924	3,270
Year five	2,017	1,034
More than five years	921	593
Revolving	75,666	82,125
Revolving-Term	1,874	1,411
Total	115,264	124,609
Consumer Loans | Other consumer | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	30	0
Year three	7	124
Year four	193	0
Year five	0	0
More than five years	131	131
Revolving	0	0
Revolving-Term	6	14
Total	$ 367	$ 269