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INVESTMENT SECURITIES - Amortized Cost and Fair Values of AFS Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 403,090	$ 460,999
Gross Unrealized Gains	8,927	12,054
Gross Unrealized Losses	4,327	6,588
Fair Value	407,690	466,465
States and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	128,214	104,704
Gross Unrealized Gains	6,834	9,091
Gross Unrealized Losses	1,375	1,125
Fair Value	133,673	112,670
GSE residential MBSs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,811	4,197
Gross Unrealized Gains	57	96
Gross Unrealized Losses	7	0
Fair Value	7,861	4,293
GSE residential CMOs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	41,374	56,856
Gross Unrealized Gains	681	2,226
Gross Unrealized Losses	1,893	1,071
Fair Value	40,162	58,011
Non-agency CMOs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	16,030	16,505
Gross Unrealized Gains	472	413
Gross Unrealized Losses	0	0
Fair Value	16,502	16,918
Private label commercial CMOs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		63,941
Gross Unrealized Gains		57
Gross Unrealized Losses		1,762
Fair Value		62,236
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	209,273	214,425
Gross Unrealized Gains	883	171
Gross Unrealized Losses	1,052	2,630
Fair Value	209,104	211,966
Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	388	371
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 388	$ 371

X

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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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