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Note 4 - Loans and the Allowance for Credit Losses - Collateral Dependent Loans (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		$ 8,109,161	$ 6,838,351
Real Estate [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		71,925	83,681
Other Collateral Pledged [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		22,517	26,182
Collateral Pledged [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		94,442	109,863
Commercial Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	[1]	1,472,734	1,299,428
Commercial Portfolio Segment [Member] | Real Estate [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		5,352	6,385
Commercial Portfolio Segment [Member] | Other Collateral Pledged [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		22,517	26,182
Commercial Portfolio Segment [Member] | Collateral Pledged [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		27,869	32,567
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		5,795,228	4,741,590
Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		52,477	55,244
Commercial Real Estate Portfolio Segment [Member] | Other Collateral Pledged [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		0	0
Commercial Real Estate Portfolio Segment [Member] | Collateral Pledged [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		52,477	55,244
Commercial Construction Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		574,139	540,178
Commercial Construction Portfolio Segment [Member] | Real Estate [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		8,232	13,196
Commercial Construction Portfolio Segment [Member] | Other Collateral Pledged [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		0	0
Commercial Construction Portfolio Segment [Member] | Collateral Pledged [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		8,232	13,196
Residential Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		264,748	255,269
Residential Portfolio Segment [Member] | Real Estate [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		5,864	8,856
Residential Portfolio Segment [Member] | Other Collateral Pledged [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		0	0
Residential Portfolio Segment [Member] | Collateral Pledged [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		$ 5,864	$ 8,856
[1] Included in commercial loans as of December 31, 2022 and December 31, 2021 were Paycheck Protection Program (“PPP”) loans of $11.4 million and $93.1 million, respectively. These loans are 100% federally guaranteed and currently not subject to any allocation of allowance for credit losses.

X

- Definition

Amortized cost, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

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