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Investment Securities - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	$ 689,001	$ 466,747
Available-for-sale investment securities, Amortized cost	689,001	466,747
Available-for-sale debt securities	710,092	470,746
Available-for-sale investment securities	710,092	470,746
Available-for-sale Securities, Gross Unrealized Gains	23,371	8,688
Available-for-sale Securities, Gross Unrealized Losses	(2,280)	(4,689)
U.S. Government agencies
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	651	14,740
Available-for-sale debt securities	680	14,494
Available-for-sale Securities, Gross Unrealized Gains	29	12
Available-for-sale Securities, Gross Unrealized Losses	0	(258)
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	361,734	89,574
Available-for-sale debt securities	379,565	91,111
Available-for-sale Securities, Gross Unrealized Gains	18,170	2,965
Available-for-sale Securities, Gross Unrealized Losses	(339)	(1,428)
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	214,203	198,125
Available-for-sale debt securities	216,298	196,719
Available-for-sale Securities, Gross Unrealized Gains	3,575	1,409
Available-for-sale Securities, Gross Unrealized Losses	(1,480)	(2,815)
Private label residential mortgage and asset backed securities
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	82,413	155,308
Available-for-sale debt securities	83,508	159,378
Available-for-sale Securities, Gross Unrealized Gains	1,337	4,223
Available-for-sale Securities, Gross Unrealized Losses	(242)	(153)
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	30,000	9,000
Available-for-sale debt securities	30,041	9,044
Available-for-sale Securities, Gross Unrealized Gains	260	79
Available-for-sale Securities, Gross Unrealized Losses	$ (219)	$ (35)

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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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