Loans - Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	$ 151,985		$ 649,217
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	637,572		617,729
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	576,367		456,414
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	423,641		509,173
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	483,483		347,429
Prior	1,013,701		723,411
Revolving Loans Amortized Cost Basis	152,217		149,720
Revolving Loan Converted to Term	0		0
Total	3,438,966		3,453,093
Current-period gross charge-offs
Financing receivable, excluding accrued interest, year one, originated, current fiscal year, writeoff	0		291
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year, writeoff	135		1,472
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year, writeoff	469		1,380
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year, writeoff	341		1,387
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year, writeoff	293		2,560
Prior	336		2,464
Revolving Loans Amortized Cost Basis	0		0
Revolving Loan Converted to Term	0		0
Total	1,574	$ 1,550	9,554
Commercial
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	12,197		41,051
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	39,584		41,908
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	39,390		21,106
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	19,066		16,007
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	16,147		12,070
Prior	30,946		22,813
Revolving Loans Amortized Cost Basis	12,269		10,774
Revolving Loan Converted to Term	0		0
Total	169,599		165,729
Current-period gross charge-offs
Financing receivable, excluding accrued interest, year one, originated, current fiscal year, writeoff	0		0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year, writeoff	0		0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year, writeoff	0		0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year, writeoff	0		0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year, writeoff	0		0
Prior	0		0
Revolving Loans Amortized Cost Basis	0		0
Revolving Loan Converted to Term	0		0
Total	0		0
Commercial Real Estate
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	8,157		92,787
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	95,882		119,964
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	119,478		79,339
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	78,800		139,711
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	143,451		101,358
Prior	362,452		282,251
Revolving Loans Amortized Cost Basis	3,550		2,849
Revolving Loan Converted to Term	0		0
Total	811,770		818,259
Current-period gross charge-offs
Financing receivable, excluding accrued interest, year one, originated, current fiscal year, writeoff	0		0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year, writeoff	0		0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year, writeoff	0		0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year, writeoff	0		0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year, writeoff	0		1,656
Prior	0		2,162
Revolving Loans Amortized Cost Basis	0		0
Revolving Loan Converted to Term	0		0
Total	0		3,818
Consumer
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	114,168		370,557
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	350,012		281,851
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	250,784		194,830
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	169,489		144,631
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	122,653		62,770
Prior	63,975		20,924
Revolving Loans Amortized Cost Basis	462		444
Revolving Loan Converted to Term	0		0
Total	1,071,543		1,076,007
Current-period gross charge-offs
Financing receivable, excluding accrued interest, year one, originated, current fiscal year, writeoff	0		291
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year, writeoff	135		1,472
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year, writeoff	469		1,380
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year, writeoff	341		1,367
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year, writeoff	293		904
Prior	322		271
Revolving Loans Amortized Cost Basis	0		0
Revolving Loan Converted to Term	0		0
Total	1,560	1,519	5,685
Residential
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	17,463		144,822
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	152,094		174,006
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	166,715		161,139
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	156,286		208,824
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	201,232		171,231
Prior	556,328		397,423
Revolving Loans Amortized Cost Basis	135,936		135,653
Revolving Loan Converted to Term	0		0
Total	1,386,054		1,393,098
Current-period gross charge-offs
Financing receivable, excluding accrued interest, year one, originated, current fiscal year, writeoff	0		0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year, writeoff	0		0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year, writeoff	0		0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year, writeoff	0		20
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year, writeoff	0		0
Prior	14		31
Revolving Loans Amortized Cost Basis	0		0
Revolving Loan Converted to Term	0		0
Total	14	$ 31	51
Satisfactory | Commercial
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	12,197		40,855
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	39,452		41,908
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	39,302		20,671
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	18,748		15,915
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	15,402		12,070
Prior	28,085		19,917
Revolving Loans Amortized Cost Basis	11,114		9,765
Revolving Loan Converted to Term	0		0
Total	164,300		161,101
Satisfactory | Commercial Real Estate
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	8,157		90,358
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	93,054		113,616
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	113,161		78,723
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	77,881		128,103
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	133,042		96,305
Prior	345,620		264,374
Revolving Loans Amortized Cost Basis	3,286		2,112
Revolving Loan Converted to Term	0		0
Total	774,201		773,591
Special mention | Commercial
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	0		196
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	132		0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	0		25
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	25		0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	0		0
Prior	0		0
Revolving Loans Amortized Cost Basis	0		0
Revolving Loan Converted to Term	0		0
Total	157		221
Special mention | Commercial Real Estate
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	0		302
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	301		6,348
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	6,317		275
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	778		7,504
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	7,449		4,749
Prior	7,653		3,808
Revolving Loans Amortized Cost Basis	0		473
Revolving Loan Converted to Term	0		0
Total	22,498		23,459
Substandard | Commercial
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	0		0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	0		0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	88		410
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	293		92
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	745		0
Prior	2,861		2,896
Revolving Loans Amortized Cost Basis	1,155		1,009
Revolving Loan Converted to Term	0		0
Total	5,142		4,407
Substandard | Commercial Real Estate
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	0		2,127
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	2,527		0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	0		341
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	141		4,104
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	2,960		304
Prior	9,179		14,069
Revolving Loans Amortized Cost Basis	264		264
Revolving Loan Converted to Term	0		0
Total	15,071		21,209
Doubtful | Commercial
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	0		0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	0		0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	0		0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	0		0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	0		0
Prior	0		0
Revolving Loans Amortized Cost Basis	0		0
Revolving Loan Converted to Term	0		0
Total	0		0
Doubtful | Commercial Real Estate
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	0		0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	0		0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	0		0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	0		0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	0		0
Prior	0		0
Revolving Loans Amortized Cost Basis	0		0
Revolving Loan Converted to Term	0		0
Total	0		0
Performing | Consumer
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	114,168		370,436
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	349,748		281,349
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	250,442		194,467
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	169,275		144,210
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	122,322		62,395
Prior	63,771		20,796
Revolving Loans Amortized Cost Basis	462		444
Revolving Loan Converted to Term	0		0
Total	1,070,188		1,074,097
Performing | Residential
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	17,463		144,618
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	151,890		172,965
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	166,240		160,802
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	156,001		206,858
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	201,232		170,889
Prior	554,780		395,132
Revolving Loans Amortized Cost Basis	135,684		135,483
Revolving Loan Converted to Term	0		0
Total	1,383,290		1,386,747
Nonperforming | Consumer
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	0		121
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	264		502
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	342		363
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	214		421
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	331		375
Prior	204		128
Revolving Loans Amortized Cost Basis	0		0
Revolving Loan Converted to Term	0		0
Total	1,355		1,910
Nonperforming | Residential
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	0		204
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	204		1,041
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	475		337
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	285		1,966
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	0		342
Prior	1,548		2,291
Revolving Loans Amortized Cost Basis	252		170
Revolving Loan Converted to Term	0		0
Total	$ 2,764		$ 6,351