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Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Values (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Investment Holdings [Line Items]
Amortized Cost	$ 802,391	$ 939,160
Gross Unrealized Gains	33,017	14,660
Gross Unrealized Losses	(916)	(1,508)
Fair Value	834,492	952,312
U.S. government and agency securities
Investment Holdings [Line Items]
Amortized Cost	50,752	104,709
Gross Unrealized Gains	1,165	598
Gross Unrealized Losses	(24)	(84)
Fair Value	51,893	105,223
Municipal securities
Investment Holdings [Line Items]
Amortized Cost	193,300	128,183
Gross Unrealized Gains	12,247	4,933
Gross Unrealized Losses	(237)	(102)
Fair Value	205,310	133,014
Residential CMO and MBS
Investment Holdings [Line Items]
Amortized Cost	216,719	336,929
Gross Unrealized Gains	6,129	3,184
Gross Unrealized Losses	(267)	(505)
Fair Value	222,581	339,608
Commercial CMO and MBS
Investment Holdings [Line Items]
Amortized Cost	292,163	322,169
Gross Unrealized Gains	12,785	5,575
Gross Unrealized Losses	(266)	(649)
Fair Value	304,682	327,095
Corporate obligations
Investment Holdings [Line Items]
Amortized Cost	19,947	23,893
Gross Unrealized Gains	231	316
Gross Unrealized Losses	(7)	(15)
Fair Value	20,171	24,194
Other asset-backed securities
Investment Holdings [Line Items]
Amortized Cost	29,510	23,277
Gross Unrealized Gains	460	54
Gross Unrealized Losses	(115)	(153)
Fair Value	$ 29,855	$ 23,178

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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Amount 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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