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Note 4 - Loans Receivable and Allowance for Credit Losses on Loans - Schedule of Past Due Loans (Details) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, before Allowance for Credit Loss		$ 2,433,015	$ 2,218,852	$ 1,754,175
Financing Receivable, Nonaccrual	[1]	10,952	8,652
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		2,268	3,010
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		1,630	1,211
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		3,570	3,719
Financial Asset, Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		7,468	7,940
Financial Asset, Not Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		2,425,547	2,210,912
Real Estate Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss		1,530,381	1,421,260	1,090,303
Financing Receivable, Nonaccrual	[1]	6,056	966
Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		79	29
Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		121	104
Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		136	479
Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		336	612
Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		1,530,045	1,420,648
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, before Allowance for Credit Loss		366,328	334,059
Financing Receivable, Nonaccrual	[1]	1,088	0
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		0	0
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		0	0
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		0	0
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		0	0
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		366,328	334,059
Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, before Allowance for Credit Loss		303,054	342,591
Financing Receivable, Nonaccrual	[1]	4,699	0
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		0	0
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		0	0
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		0	0
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		0	0
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		303,054	342,591
Real Estate Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivable, before Allowance for Credit Loss		69,488	55,387
Financing Receivable, Nonaccrual	[1]	173	46
Real Estate Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		79	29
Real Estate Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		25	104
Real Estate Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		136	16
Real Estate Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		240	149
Real Estate Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		69,248	55,238
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member]
Financing Receivable, before Allowance for Credit Loss		567,742	469,485
Financing Receivable, Nonaccrual	[1]	96	920
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		0	0
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		96	0
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		0	463
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		96	463
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		567,646	469,022
Real Estate Portfolio Segment [Member] | Multifamily [Member]
Financing Receivable, before Allowance for Credit Loss		223,769	219,738
Financing Receivable, Nonaccrual	[1]	0	0
Real Estate Portfolio Segment [Member] | Multifamily [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		0	0
Real Estate Portfolio Segment [Member] | Multifamily [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		0	0
Real Estate Portfolio Segment [Member] | Multifamily [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		0	0
Real Estate Portfolio Segment [Member] | Multifamily [Member] | Financial Asset, Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		0	0
Real Estate Portfolio Segment [Member] | Multifamily [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		223,769	219,738
Consumer Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss		646,753	569,572	422,043
Financing Receivable, Nonaccrual	[1]	2,213	1,352
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		2,189	2,980
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		1,509	1,107
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		920	623
Consumer Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		4,618	4,710
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		642,135	564,862
Consumer Portfolio Segment [Member] | Indirect Home Improvement Loan [Member]
Financing Receivable, before Allowance for Credit Loss		569,903	495,941
Financing Receivable, Nonaccrual	[1]	1,863	1,076
Consumer Portfolio Segment [Member] | Indirect Home Improvement Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		1,759	2,298
Consumer Portfolio Segment [Member] | Indirect Home Improvement Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		1,248	685
Consumer Portfolio Segment [Member] | Indirect Home Improvement Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		777	532
Consumer Portfolio Segment [Member] | Indirect Home Improvement Loan [Member] | Financial Asset, Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		3,784	3,515
Consumer Portfolio Segment [Member] | Indirect Home Improvement Loan [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		566,119	492,426
Consumer Portfolio Segment [Member] | Marine Loans [Member]
Financing Receivable, before Allowance for Credit Loss		73,310	70,567
Financing Receivable, Nonaccrual	[1]	342	267
Consumer Portfolio Segment [Member] | Marine Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		373	650
Consumer Portfolio Segment [Member] | Marine Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		243	385
Consumer Portfolio Segment [Member] | Marine Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		137	86
Consumer Portfolio Segment [Member] | Marine Loans [Member] | Financial Asset, Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		753	1,121
Consumer Portfolio Segment [Member] | Marine Loans [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		72,557	69,446
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Financing Receivable, before Allowance for Credit Loss		3,540	3,064
Financing Receivable, Nonaccrual	[1]	8	9
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		57	32
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		18	37
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		6	5
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Financial Asset, Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		81	74
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		3,459	2,990
Commercial Business Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss		255,881	228,020	$ 241,829
Financing Receivable, Nonaccrual	[1]	2,683	6,334
Commercial Business Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		0	1
Commercial Business Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		0	0
Commercial Business Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		2,514	2,617
Commercial Business Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		2,514	2,618
Commercial Business Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		253,367	225,402
Commercial Business Portfolio Segment [Member] | Commercial Loan [Member]
Financing Receivable, before Allowance for Credit Loss		238,301	196,791
Financing Receivable, Nonaccrual	[1]	2,683	6,334
Commercial Business Portfolio Segment [Member] | Commercial Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		0	1
Commercial Business Portfolio Segment [Member] | Commercial Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		0	0
Commercial Business Portfolio Segment [Member] | Commercial Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		2,514	2,617
Commercial Business Portfolio Segment [Member] | Commercial Loan [Member] | Financial Asset, Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		2,514	2,618
Commercial Business Portfolio Segment [Member] | Commercial Loan [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		235,787	194,173
Commercial Business Portfolio Segment [Member] | Warehouse Lending Loan [Member]
Financing Receivable, before Allowance for Credit Loss		17,580	31,229
Financing Receivable, Nonaccrual	[1]	0	0
Commercial Business Portfolio Segment [Member] | Warehouse Lending Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		0	0
Commercial Business Portfolio Segment [Member] | Warehouse Lending Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		0	0
Commercial Business Portfolio Segment [Member] | Warehouse Lending Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		0	0
Commercial Business Portfolio Segment [Member] | Warehouse Lending Loan [Member] | Financial Asset, Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		0	0
Commercial Business Portfolio Segment [Member] | Warehouse Lending Loan [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, before Allowance for Credit Loss		$ 17,580	$ 31,229
[1] Includes past due loans as applicable.

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Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease.

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