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Note 5 - Loans and the Allowance for Credit Losses - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Gross loans	$ 8,188,210	$ 8,109,161
Real Estate [Member]
Gross loans	61,982	71,925
Other Collateral Pledged [Member]
Gross loans	14,719	22,517
Collateral Pledged [Member]
Gross loans	76,701	94,442
Commercial Portfolio Segment [Member]
Gross loans	1,475,571	1,472,734
Commercial Portfolio Segment [Member] | Real Estate [Member]
Gross loans	4,891	5,352
Commercial Portfolio Segment [Member] | Other Collateral Pledged [Member]
Gross loans	14,719	22,517
Commercial Portfolio Segment [Member] | Collateral Pledged [Member]
Gross loans	19,610	27,869
Commercial Real Estate Portfolio Segment [Member]
Gross loans	5,837,539	5,795,228
Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Gross loans	41,636	52,477
Commercial Real Estate Portfolio Segment [Member] | Other Collateral Pledged [Member]
Gross loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Collateral Pledged [Member]
Gross loans	41,636	52,477
Commercial Construction Portfolio Segment [Member]
Gross loans	622,748	574,139
Commercial Construction Portfolio Segment [Member] | Real Estate [Member]
Gross loans	8,700	8,232
Commercial Construction Portfolio Segment [Member] | Other Collateral Pledged [Member]
Gross loans	0	0
Commercial Construction Portfolio Segment [Member] | Collateral Pledged [Member]
Gross loans	8,700	8,232
Residential Portfolio Segment [Member]
Gross loans	251,416	264,748
Residential Portfolio Segment [Member] | Real Estate [Member]
Gross loans	6,755	5,864
Residential Portfolio Segment [Member] | Other Collateral Pledged [Member]
Gross loans	0	0
Residential Portfolio Segment [Member] | Collateral Pledged [Member]
Gross loans	$ 6,755	$ 5,864

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
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-5

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481990/310-10-45-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

+ Details

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