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Note 2 - Securities - Securities with Unrealized Losses Aggregated by Investment Category and Time with Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Less than 12 months, Fair Value	$ 515,182	$ 84,529
Less than 12 months, Unrealized Losses	10,599	891
More than 12 months, Fair Value	102,211	9,994
More than 12 months, Unrealized Losses	4,196	6
Total, Fair Value	617,393	94,523
Total, Unrealized Losses	14,795	897
US Treasury and Government [Member]
Less than 12 months, Fair Value	0	0
Less than 12 months, Unrealized Losses	0	0
More than 12 months, Fair Value	0	0
More than 12 months, Unrealized Losses	0	0
Total, Fair Value	0	0
Total, Unrealized Losses	0	0
US Treasury Securities [Member]
Less than 12 months, Fair Value	89,958	0
Less than 12 months, Unrealized Losses	1,311	0
More than 12 months, Fair Value	0	0
More than 12 months, Unrealized Losses	0	0
Total, Fair Value	89,958	0
Total, Unrealized Losses	1,311	0
US States and Political Subdivisions Debt Securities [Member]
Less than 12 months, Fair Value	130,001	8,950
Less than 12 months, Unrealized Losses	3,253	24
More than 12 months, Fair Value	15,237	0
More than 12 months, Unrealized Losses	856	0
Total, Fair Value	145,238	8,950
Total, Unrealized Losses	4,109	24
Collateralized Mortgage Backed Securities [Member]
Less than 12 months, Fair Value	261,560	75,126
Less than 12 months, Unrealized Losses	5,709	866
More than 12 months, Fair Value	86,974	9,994
More than 12 months, Unrealized Losses	3,340	6
Total, Fair Value	348,534	85,120
Total, Unrealized Losses	9,049	872
Corporate Debt Securities [Member]
Less than 12 months, Fair Value	17,369	453
Less than 12 months, Unrealized Losses	233	1
More than 12 months, Fair Value	0	0
More than 12 months, Unrealized Losses	0	0
Total, Fair Value	17,369	453
Total, Unrealized Losses	233	1
Asset-backed Securities [Member]
Less than 12 months, Fair Value	16,294	0
Less than 12 months, Unrealized Losses	93	0
More than 12 months, Fair Value	0	0
More than 12 months, Unrealized Losses	0	0
Total, Fair Value	16,294	0
Total, Unrealized Losses	$ 93	$ 0

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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