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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Available for Sale    
Amortized Cost $ 1,646,508 $ 1,156,031
Gross Unrealized Gains 9,924 28,005
Gross Unrealized Losses (24,733) (1,427)
Fair Value 1,631,699 1,182,609
Equity securities, amortized cost 0 1,068
Equity securities, gross unrealized gains 0 283
Equity securities, gross unrealized losses 0 0
Equity securities, at fair value 0 1,351
States and political subdivisions    
Available for Sale    
Amortized Cost 235,521 163,573
Gross Unrealized Gains 3,156 5,370
Gross Unrealized Losses (1,849) (177)
Fair Value 236,828 168,766
Corporate securities    
Available for Sale    
Amortized Cost 41,687 47,351
Gross Unrealized Gains 24 788
Gross Unrealized Losses (1,065) (131)
Fair Value 40,646 48,008
U.S. Treasury obligations and direct obligations of U.S Government agencies    
Available for Sale    
Amortized Cost 35,833 33,413
Gross Unrealized Gains 69 18
Gross Unrealized Losses (568) (286)
Fair Value 35,334 33,145
Residential - U.S. Government-sponsored entities ("GSEs")    
Available for Sale    
Amortized Cost 1,213,910 762,309
Gross Unrealized Gains 4,899 16,816
Gross Unrealized Losses (19,993) (299)
Fair Value 1,198,816 778,826
Residential - Non-government sponsored entities    
Available for Sale    
Amortized Cost 11,942 22,671
Gross Unrealized Gains 335 786
Gross Unrealized Losses (64) (34)
Fair Value 12,213 23,423
Commercial - Non-GSEs    
Available for Sale    
Amortized Cost 41,328 41,309
Gross Unrealized Gains 685 1,663
Gross Unrealized Losses 0 0
Fair Value 42,013 42,972
Commercial - U.S. GSEs and agencies    
Available for Sale    
Amortized Cost 66,287 85,405
Gross Unrealized Gains 756 2,564
Gross Unrealized Losses (1,194) (500)
Fair Value $ 65,849 $ 87,469