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Investment Securities - Reconciliation (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 770,195	$ 939,160
Gross Unrealized Gains	32,521	14,660
Gross Unrealized Losses	(553)	(1,508)
Fair Value	802,163	952,312
U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	44,713	104,709
Gross Unrealized Gains	947	598
Gross Unrealized Losses	0	(84)
Fair Value	45,660	105,223
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	197,634	128,183
Gross Unrealized Gains	12,561	4,933
Gross Unrealized Losses	(227)	(102)
Fair Value	209,968	133,014
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	196,956	336,929
Gross Unrealized Gains	5,125	3,184
Gross Unrealized Losses	(209)	(505)
Fair Value	201,872	339,608
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	290,638	322,169
Gross Unrealized Gains	13,198	5,575
Gross Unrealized Losses	(90)	(649)
Fair Value	303,746	327,095
Other asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,971	23,893
Gross Unrealized Gains	125	316
Gross Unrealized Losses	0	(15)
Fair Value	11,096	24,194
Other Security Investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	29,283	23,277
Gross Unrealized Gains	565	54
Gross Unrealized Losses	(27)	(153)
Fair Value	$ 29,821	$ 23,178

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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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