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Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Values (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Investment Holdings [Line Items]
Amortized Cost	$ 876,357	$ 770,195
Gross Unrealized Gains	24,646	32,521
Gross Unrealized Losses	(7,445)	(553)
Fair Value	893,558	802,163
U.S. government and agency securities
Investment Holdings [Line Items]
Amortized Cost	96,415	44,713
Gross Unrealized Gains	630	947
Gross Unrealized Losses	(2,188)	0
Fair Value	94,857	45,660
Municipal securities
Investment Holdings [Line Items]
Amortized Cost	219,373	197,634
Gross Unrealized Gains	10,001	12,561
Gross Unrealized Losses	(1,711)	(227)
Fair Value	227,663	209,968
Residential CMO and MBS
Investment Holdings [Line Items]
Amortized Cost	179,680	196,956
Gross Unrealized Gains	4,233	5,125
Gross Unrealized Losses	(917)	(209)
Fair Value	182,996	201,872
Commercial CMO and MBS
Investment Holdings [Line Items]
Amortized Cost	341,620	290,638
Gross Unrealized Gains	9,168	13,198
Gross Unrealized Losses	(2,619)	(90)
Fair Value	348,169	303,746
Corporate obligations
Investment Holdings [Line Items]
Amortized Cost	10,989	10,971
Gross Unrealized Gains	66	125
Gross Unrealized Losses	0	0
Fair Value	11,055	11,096
Other asset-backed securities
Investment Holdings [Line Items]
Amortized Cost	28,280	29,283
Gross Unrealized Gains	548	565
Gross Unrealized Losses	(10)	(27)
Fair Value	$ 28,818	$ 29,821

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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