Loans and Allowance for Credit Losses - Loan Balances by Year of Origination and Performing and Nonperforming Status (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	$ 893,015	$ 1,117,436
Year two	1,134,650	1,320,936
Year three	1,191,528	1,094,225
Year four	897,782	503,703
Year five	421,743	645,502
More than five years	1,885,462	1,650,211
Revolving	1,284,808	1,292,135
Revolving-Term	33,970	29,193
Total	7,742,958	7,653,341
Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	893,015	1,117,436
Year two	1,131,744	1,320,560
Year three	1,190,371	1,094,056
Year four	896,661	502,950
Year five	418,574	640,393
More than five years	1,877,620	1,635,979
Revolving	1,274,906	1,291,683
Revolving-Term	32,130	27,337
Total	7,715,021	7,630,394
Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	2,906	376
Year three	1,157	169
Year four	1,121	753
Year five	3,169	5,109
More than five years	7,842	14,232
Revolving	9,902	452
Revolving-Term	1,840	1,856
Total	27,937	22,947
Commercial Loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	278,187	276,677
Year two	289,081	324,469
Year three	363,529	439,308
Year four	415,621	240,256
Year five	215,632	419,371
More than five years	1,110,490	926,636
Revolving	35,991	32,418
Revolving-Term	0	0
Total	2,708,531	2,659,135
Commercial Loans | Commercial real estate | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	278,187	276,677
Year two	289,081	324,469
Year three	362,544	439,308
Year four	415,621	240,256
Year five	214,589	419,371
More than five years	1,109,290	920,316
Revolving	35,991	32,418
Revolving-Term	0	0
Total	2,705,303	2,652,815
Commercial Loans | Commercial real estate | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	0
Year three	985	0
Year four	0	0
Year five	1,043	0
More than five years	1,200	6,320
Revolving	0	0
Revolving-Term	0	0
Total	3,228	6,320
Commercial Loans | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	120,143	171,861
Year two	148,100	231,978
Year three	195,756	210,636
Year four	152,971	54,696
Year five	31,312	52,858
More than five years	197,426	193,905
Revolving	505,929	520,249
Revolving-Term	0	0
Total	1,351,637	1,436,183
Commercial Loans | Commercial and industrial | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	120,143	171,861
Year two	148,070	231,978
Year three	195,584	210,636
Year four	151,976	54,696
Year five	30,103	52,858
More than five years	197,426	193,257
Revolving	497,162	520,019
Revolving-Term	0	0
Total	1,340,464	1,435,305
Commercial Loans | Commercial and industrial | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	30	0
Year three	172	0
Year four	995	0
Year five	1,209	0
More than five years	0	648
Revolving	8,767	230
Revolving-Term	0	0
Total	11,173	878
Commercial Loans | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	119,355	75,596
Year two	121,816	154,456
Year three	73,851	82,313
Year four	14,911	14,845
Year five	884	4,727
More than five years	2,139	4,438
Revolving	8,310	14,208
Revolving-Term	0	0
Total	341,266	350,583
Commercial Loans | Commercial construction | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	119,355	75,596
Year two	121,816	154,456
Year three	73,851	82,313
Year four	14,911	14,845
Year five	884	151
More than five years	2,139	4,054
Revolving	8,310	14,208
Revolving-Term	0	0
Total	341,266	345,623
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	4,576
More than five years	0	384
Revolving	0	0
Revolving-Term	0	0
Total	0	4,960
Commercial Loans | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	149,624	270,129
Year two	233,041	262,606
Year three	226,654	207,611
Year four	177,683	88,018
Year five	76,643	99,574
More than five years	345,327	334,766
Revolving	92,981	96,754
Revolving-Term	1,305	1,307
Total	1,303,258	1,360,765
Commercial Loans | Business banking | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	149,624	270,129
Year two	232,649	262,606
Year three	226,654	207,611
Year four	177,683	87,979
Year five	76,344	99,354
More than five years	343,064	330,902
Revolving	92,981	96,754
Revolving-Term	1,271	1,283
Total	1,300,270	1,356,618
Commercial Loans | Business banking | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	392	0
Year three	0	0
Year four	0	39
Year five	299	220
More than five years	2,263	3,864
Revolving	0	0
Revolving-Term	34	24
Total	2,988	4,147
Consumer Loans | Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	217,250	311,887
Year two	335,763	335,462
Year three	324,389	147,850
Year four	133,347	102,041
Year five	95,504	67,890
More than five years	229,462	189,794
Revolving	570,558	552,080
Revolving-Term	27,236	24,774
Total	1,933,509	1,731,778
Consumer Loans | Consumer real estate | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	217,250	311,887
Year two	333,279	335,086
Year three	324,389	147,689
Year four	133,224	101,518
Year five	94,971	67,577
More than five years	225,225	186,909
Revolving	569,423	551,858
Revolving-Term	25,430	22,942
Total	1,923,191	1,725,466
Consumer Loans | Consumer real estate | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	2,484	376
Year three	0	161
Year four	123	523
Year five	533	313
More than five years	4,237	2,885
Revolving	1,135	222
Revolving-Term	1,806	1,832
Total	10,318	6,312
Consumer Loans | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	8,456	11,286
Year two	6,849	11,965
Year three	7,349	6,507
Year four	3,249	3,847
Year five	1,768	1,082
More than five years	618	672
Revolving	71,039	76,426
Revolving-Term	5,429	3,112
Total	104,757	114,897
Consumer Loans | Other consumer | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	8,456	11,286
Year two	6,849	11,965
Year three	7,349	6,499
Year four	3,246	3,656
Year five	1,683	1,082
More than five years	476	541
Revolving	71,039	76,426
Revolving-Term	5,429	3,112
Total	104,527	114,567
Consumer Loans | Other consumer | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	0
Year three	0	8
Year four	3	191
Year five	85	0
More than five years	142	131
Revolving	0	0
Revolving-Term	0	0
Total	$ 230	$ 330