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SECURITIES (Schedule of Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract]        
Amortized Cost $ 27,203 $ 27,203    
Fair Value 28,694 26,981    
Debt Securities, Available-for-sale [Abstract]        
Debt Securities, Available-for-sale, Amortized Cost 3,218,777 3,653,160    
Gross Unrealized Gains 1,463 36,927    
Gross Unrealized Losses (431,209) (51,094)    
Allowance for Credit Losses 0 0    
Securities—available-for-sale 2,789,031 3,638,993    
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]        
Amortized Cost 1,117,967 521,355    
Gross Unrealized Gains 109 21,917    
Gross Unrealized Losses (175,896) (1,419)    
Debt Securities, Held-to-maturity, Fair Value 942,180 541,853    
Allowance for Credit Losses (379) (433) $ (94) $ 0
U.S. Government and agency obligations        
Debt Securities, Available-for-sale [Abstract]        
Debt Securities, Available-for-sale, Amortized Cost 56,344 201,101    
Gross Unrealized Gains 8 852    
Gross Unrealized Losses (1,244) (621)    
Allowance for Credit Losses 0 0    
Securities—available-for-sale 55,108 201,332    
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]        
Amortized Cost 312 316    
Gross Unrealized Gains 0 3    
Gross Unrealized Losses (7) 0    
Debt Securities, Held-to-maturity, Fair Value 305 319    
Allowance for Credit Losses 0 0 0 0
Municipal bonds        
Debt Securities, Available-for-sale [Abstract]        
Debt Securities, Available-for-sale, Amortized Cost 301,449 293,761    
Gross Unrealized Gains 530 15,171    
Gross Unrealized Losses (40,770) (320)    
Allowance for Credit Losses 0 0    
Securities—available-for-sale 261,209 308,612    
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]        
Amortized Cost 503,117 420,555    
Gross Unrealized Gains 109 20,743    
Gross Unrealized Losses (70,907) (1,393)    
Debt Securities, Held-to-maturity, Fair Value 432,319 439,905    
Allowance for Credit Losses (183) (203) (59) 0
Corporate bonds        
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract]        
Amortized Cost 27,203 27,203    
Fair Value 28,694 26,981    
Debt Securities, Available-for-sale [Abstract]        
Debt Securities, Available-for-sale, Amortized Cost 133,334 114,427    
Gross Unrealized Gains 0 3,103    
Gross Unrealized Losses (11,481) (183)    
Allowance for Credit Losses 0 0    
Securities—available-for-sale 121,853 117,347    
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]        
Amortized Cost 2,961 3,092    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses (16) (3)    
Debt Securities, Held-to-maturity, Fair Value 2,945 3,089    
Allowance for Credit Losses (196) (230) (35) 0
Mortgage-backed or related securities        
Debt Securities, Available-for-sale [Abstract]        
Debt Securities, Available-for-sale, Amortized Cost 2,505,172 2,837,480    
Gross Unrealized Gains 885 17,749    
Gross Unrealized Losses (366,721) (49,961)    
Allowance for Credit Losses 0 0    
Securities—available-for-sale 2,139,336 2,805,268    
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]        
Amortized Cost 611,577 97,392    
Gross Unrealized Gains 0 1,171    
Gross Unrealized Losses (104,966) (23)    
Debt Securities, Held-to-maturity, Fair Value 506,611 98,540    
Allowance for Credit Losses 0 0 $ 0 $ 0
Asset-backed securities        
Debt Securities, Available-for-sale [Abstract]        
Debt Securities, Available-for-sale, Amortized Cost 222,478 206,391    
Gross Unrealized Gains 40 52    
Gross Unrealized Losses (10,993) (9)    
Allowance for Credit Losses 0 0    
Securities—available-for-sale $ 211,525 $ 206,434