Note 4 - Loans Leases Receivable (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) lease item loan	Dec. 31, 2020 USD ($) loan lease contract	Dec. 31, 2019 USD ($)	Jan. 01, 2021 USD ($)	Dec. 31, 2018 USD ($)
Loans and leases	$ 4,680,132,000	$ 4,243,791,000
Loans receivable held for sale	3,828,000	$ 3,758,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract		1
Financing Receivable, Modifications, Post-Modification Recorded Investment	2,599,000	$ 1,022,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		44,000
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down		266,000
Less allowance for estimated losses on loans/leases	78,721,000	84,376,000	$ 36,001,000	$ 84,376,000	$ 39,847,000
Provision for Loan and Lease Losses	5,702,000	55,704,000	6,638,000
Allowance for Loan and Lease Losses, Write-offs	4,538,000	8,383,000	5,134,000
Recoveries on loans/leases previously charged off	$ 1,283,000	1,054,000	772,000
Number of troubled debt restructurings written off | item	5
Threshold for Related Party Loans Evaluated	$ 60,000	60,000	60,000
Interest income on nonaccrual loans	$ 494,000,000	$ 1,700,000
Number of Loans / Leases	3,000	4
C&I - other
Loans and leases	$ 4,640,000
m2 Lease Funds, LLC
Financing Receivable, Loan Modification, Not Treated as Troubled Debt Restructuring	$ 2,400,000
Loan Relief Program
Financing Receivable, Modification, Number of Contracts	0
Financial Receivables Loan Modification, Percent	0.05%
Nonaccrual [Member]
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 54,000	$ 880,000
Number of Loans / Leases	1	2
Troubled Debt Restructurings [Member]
Accruing Past Due 90 Days or More		$ 984,000
Residential real estate
Loans and leases		252,121,000
Residential real estate loan held for sale	$ 3,800,000
Less allowance for estimated losses on loans/leases		3,732,000	1,948,000	3,732,000	2,557,000
Provision for Loan and Lease Losses		1,755,000	163,000
Allowance for Loan and Lease Losses, Write-offs			191,000
Recoveries on loans/leases previously charged off		29,000	47,000
Commercial Portfolio Segment [Member]
Loans and leases	1,595,085,000	1,726,723,000
Less allowance for estimated losses on loans/leases	29,889,000	35,421,000	16,072,000	35,421,000	16,420,000
Provision for Loan and Lease Losses		22,899,000	3,666,000
Allowance for Loan and Lease Losses, Write-offs		4,199,000	1,476,000
Recoveries on loans/leases previously charged off		649,000	276,000
Commercial Portfolio Segment [Member] | C&I - other
Loans and leases	1,346,602,000
Less allowance for estimated losses on loans/leases	25,982,000
Provision for Loan and Lease Losses	(1,451,000)
Allowance for Loan and Lease Losses, Write-offs	2,287,000
Recoveries on loans/leases previously charged off	590,000
Commercial Portfolio Segment [Member] | m2 Lease Funds, LLC
Loans and leases	$ 225,100,000	171,500,000
Commercial Real Estate Portfolio Segment [Member]
Loans and leases		2,107,629,000
Less allowance for estimated losses on loans/leases		42,161,000	15,379,000	42,161,000	17,719,000
Provision for Loan and Lease Losses		28,671,000	1,566,000
Allowance for Loan and Lease Losses, Write-offs		2,071,000	1,722,000
Recoveries on loans/leases previously charged off		182,000	208,000
Commercial Real Estate Portfolio Segment [Member] | Troubled Debt Restructurings [Member]
Accruing Past Due 90 Days or More		836,000
Direct financing leases
Number of Leases | lease	2
Loss related to unguaranteed residual values of leases	$ 0	0	0
Loans and leases	45,191,000	66,016,000
Less allowance for estimated losses on loans/leases	1,546,000	1,764,000	1,464,000	1,764,000	1,792,000
Provision for Loan and Lease Losses		2,148,000	1,129,000
Allowance for Loan and Lease Losses, Write-offs		1,993,000	1,647,000
Recoveries on loans/leases previously charged off		145,000	190,000
Direct financing leases | PPP loans
Loans and leases	28,200,000	273,100,000
Direct financing leases | C&I - other
Less allowance for estimated losses on loans/leases	1,780,000
Provision for Loan and Lease Losses	(703,000)
Allowance for Loan and Lease Losses, Write-offs	(458,000)
Recoveries on loans/leases previously charged off	258,000
Threshold for Related Party Loans Evaluated	1,500,000
Direct financing leases | Troubled Debt Restructurings [Member]
Accruing Past Due 90 Days or More		100,000
Consumer
Loans and leases	75,311,000	91,302,000
Less allowance for estimated losses on loans/leases	930,000	1,298,000		$ 1,298,000
Provision for Loan and Lease Losses	(509,000)
Allowance for Loan and Lease Losses, Write-offs	46,000
Recoveries on loans/leases previously charged off	324,000
Consumer | Troubled Debt Restructurings [Member]
Accruing Past Due 90 Days or More		48,000
Installment and other consumer loans
Loans and leases		91,302,000
Less allowance for estimated losses on loans/leases		1,298,000	1,138,000		$ 1,359,000
Provision for Loan and Lease Losses		231,000	114,000
Allowance for Loan and Lease Losses, Write-offs		120,000	98,000
Recoveries on loans/leases previously charged off		$ 49,000	$ 51,000
No Lease End Option Rider [Member] | Direct financing leases
Number of Leases | lease		3
Lease residual values	$ 165,000	$ 239,000