Loans and Allowance for Credit Losses - Loan Balances by Year of Origination and Performing and Nonperforming Status (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	$ 1,166,736	$ 893,015
Year two	890,701	1,134,650
Year three	995,373	1,191,528
Year four	988,809	897,782
Year five	722,161	421,743
More than five years	1,900,975	1,885,462
Revolving	1,362,700	1,284,808
Revolving-Term	44,502	33,970
Total	8,071,957	7,742,958
Commercial loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	480,967	278,187
Year two	315,684	289,081
Year three	326,048	363,529
Year four	319,652	415,621
Year five	343,726	215,632
More than five years	1,093,130	1,110,490
Revolving	42,554	35,991
Revolving-Term	0	0
Total	2,921,761	2,708,531
Commercial loans | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	161,634	120,143
Year two	96,065	148,100
Year three	115,559	195,756
Year four	139,784	152,971
Year five	93,561	31,312
More than five years	184,888	197,426
Revolving	539,114	505,929
Revolving-Term	0	0
Total	1,330,605	1,351,637
Commercial loans | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	172,822	119,355
Year two	119,821	121,816
Year three	43,093	73,851
Year four	18,762	14,911
Year five	2,520	884
More than five years	1,260	2,139
Revolving	7,099	8,310
Revolving-Term	0	0
Total	365,377	341,266
Commercial loans | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	182,401	149,624
Year two	132,590	233,041
Year three	206,281	226,654
Year four	199,780	177,683
Year five	161,293	76,643
More than five years	338,580	345,327
Revolving	93,856	92,981
Revolving-Term	1,082	1,305
Total	1,315,863	1,303,258
Consumer loans | Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	161,896	217,250
Year two	221,288	335,763
Year three	300,460	324,389
Year four	306,962	133,347
Year five	119,961	95,504
More than five years	281,990	229,462
Revolving	620,773	570,558
Revolving-Term	33,741	27,236
Total	2,047,071	1,933,509
Consumer loans | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	7,016	8,456
Year two	5,253	6,849
Year three	3,932	7,349
Year four	3,869	3,249
Year five	1,100	1,768
More than five years	1,127	618
Revolving	59,304	71,039
Revolving-Term	9,679	5,429
Total	$ 91,280	$ 104,757