Loans and Allowance for Credit Losses - Loan Balances by Year of Origination and Performing and Nonperforming Status (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	$ 1,117,436	$ 1,271,764
Year two	1,320,936	1,214,107
Year three	1,094,225	586,544
Year four	503,703	725,517
Year five	645,502	449,759
More than five years	1,650,211	1,528,088
Revolving	1,292,135	1,381,517
Revolving-Term	29,193	26,673
Total	7,653,341	7,183,969
Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	1,117,436	1,271,764
Year two	1,320,560	1,213,905
Year three	1,094,056	585,892
Year four	502,950	724,629
Year five	640,393	448,121
More than five years	1,635,979	1,513,912
Revolving	1,291,683	1,380,980
Revolving-Term	27,337	25,714
Total	7,630,394	7,164,917
Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	376	202
Year three	169	652
Year four	753	888
Year five	5,109	1,638
More than five years	14,232	14,176
Revolving	452	537
Revolving-Term	1,856	959
Total	22,947	19,052
Commercial Loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	276,677	292,732
Year two	324,469	360,423
Year three	439,308	269,049
Year four	240,256	449,493
Year five	419,371	261,941
More than five years	926,636	883,535
Revolving	32,418	21,666
Revolving-Term	0	0
Total	2,659,135	2,538,839
Commercial Loans | Commercial real estate | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	276,677	292,732
Year two	324,469	360,423
Year three	439,308	269,049
Year four	240,256	449,493
Year five	419,371	261,941
More than five years	920,316	876,435
Revolving	32,418	21,666
Revolving-Term	0	0
Total	2,652,815	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	6,320	7,100
Revolving	0	0
Revolving-Term	0	0
Total	6,320	7,100
Commercial Loans | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	171,861	253,696
Year two	231,978	289,448
Year three	210,636	88,544
Year four	54,696	73,998
Year five	52,858	65,911
More than five years	193,905	147,273
Revolving	520,249	591,522
Revolving-Term	0	0
Total	1,436,183	1,510,392
Commercial Loans | Commercial and industrial | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	171,861	253,696
Year two	231,978	289,448
Year three	210,636	88,544
Year four	54,696	73,998
Year five	52,858	65,858
More than five years	193,257	147,273
Revolving	520,019	591,292
Revolving-Term	0	0
Total	1,435,305	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	648	0
Revolving	230	230
Revolving-Term	0	0
Total	878	283
Commercial Loans | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	75,596	120,655
Year two	154,456	170,691
Year three	82,313	40,762
Year four	14,845	14,442
Year five	4,727	3,953
More than five years	4,438	4,176
Revolving	14,208	27,284
Revolving-Term	0	0
Total	350,583	381,963
Commercial Loans | Commercial construction | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	75,596	120,655
Year two	154,456	170,691
Year three	82,313	40,762
Year four	14,845	14,442
Year five	151	3,953
More than five years	4,054	3,792
Revolving	14,208	27,284
Revolving-Term	0	0
Total	345,623	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	4,576	0
More than five years	384	384
Revolving	0	0
Revolving-Term	0	0
Total	4,960	384
Commercial Loans | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	270,129	287,679
Year two	262,606	233,723
Year three	207,611	91,149
Year four	88,018	109,731
Year five	99,574	84,889
More than five years	334,766	292,211
Revolving	96,754	105,271
Revolving-Term	1,307	1,291
Total	1,360,765	1,205,944
Commercial Loans | Business banking | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	270,129	287,679
Year two	262,606	233,656
Year three	207,611	91,149
Year four	87,979	109,479
Year five	99,354	83,689
More than five years	330,902	289,435
Revolving	96,754	105,172
Revolving-Term	1,283	1,195
Total	1,356,618	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	39	252
Year five	220	1,200
More than five years	3,864	2,776
Revolving	0	99
Revolving-Term	24	96
Total	4,147	4,490
Consumer Loans | Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	311,887	296,948
Year two	335,462	149,003
Year three	147,850	91,613
Year four	102,041	74,583
Year five	67,890	32,031
More than five years	189,794	200,169
Revolving	552,080	553,649
Revolving-Term	24,774	23,957
Total	1,731,778	1,421,953
Consumer Loans | Consumer real estate | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	311,887	296,948
Year two	335,086	148,868
Year three	147,689	91,085
Year four	101,518	73,947
Year five	67,577	31,646
More than five years	186,909	196,384
Revolving	551,858	553,441
Revolving-Term	22,942	23,108
Total	1,725,466	1,415,427
Consumer Loans | Consumer real estate | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	376	135
Year three	161	528
Year four	523	636
Year five	313	385
More than five years	2,885	3,785
Revolving	222	208
Revolving-Term	1,832	849
Total	6,312	6,526
Consumer Loans | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	11,286	20,054
Year two	11,965	10,819
Year three	6,507	5,427
Year four	3,847	3,270
Year five	1,082	1,034
More than five years	672	724
Revolving	76,426	82,125
Revolving-Term	3,112	1,425
Total	114,897	124,878
Consumer Loans | Other consumer | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	11,286	20,054
Year two	11,965	10,819
Year three	6,499	5,303
Year four	3,656	3,270
Year five	1,082	1,034
More than five years	541	593
Revolving	76,426	82,125
Revolving-Term	3,112	1,411
Total	114,567	124,609
Consumer Loans | Other consumer | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	0
Year three	8	124
Year four	191	0
Year five	0	0
More than five years	131	131
Revolving	0	0
Revolving-Term	0	14
Total	$ 330	$ 269