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Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Values (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Investment Holdings [Line Items]
Amortized Cost	$ 744,336	$ 770,195
Gross Unrealized Gains	18,946	32,521
Gross Unrealized Losses	(1,756)	(553)
Fair Value	761,526	802,163
Total	311,074	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	46
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(3,790)
Total	307,330	0
U.S. government and agency securities
Investment Holdings [Line Items]
Amortized Cost	26,000	44,713
Gross Unrealized Gains	146	947
Gross Unrealized Losses	(40)	0
Fair Value	26,106	45,660
Total	82,577
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	46
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(563)
Total	82,060
Municipal securities
Investment Holdings [Line Items]
Amortized Cost	219,737	197,634
Gross Unrealized Gains	9,385	12,561
Gross Unrealized Losses	(956)	(227)
Fair Value	228,166	209,968
Residential CMO and MBS
Investment Holdings [Line Items]
Amortized Cost	240,018	196,956
Gross Unrealized Gains	3,065	5,125
Gross Unrealized Losses	(390)	(209)
Fair Value	242,693	201,872
Total	10,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0
Total	10,000
Commercial CMO and MBS
Investment Holdings [Line Items]
Amortized Cost	229,518	290,638
Gross Unrealized Gains	5,861	13,198
Gross Unrealized Losses	(361)	(90)
Fair Value	235,018	303,746
Total	218,497
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(3,227)
Total	215,270
Corporate obligations
Investment Holdings [Line Items]
Amortized Cost	2,009	10,971
Gross Unrealized Gains	14	125
Gross Unrealized Losses	0	0
Fair Value	2,023	11,096
Other asset-backed securities
Investment Holdings [Line Items]
Amortized Cost	27,054	29,283
Gross Unrealized Gains	475	565
Gross Unrealized Losses	(9)	(27)
Fair Value	$ 27,520	$ 29,821

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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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