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SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND EQUITY SECURITIES - Schedule of Securities Available for Sale, Held to Maturity, and Equity Securities (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Securities available for sale            
Amortized  Cost $ 1,578,544 $ 1,661,196        
Gross Unrealized Gains 404 571        
Gross Unrealized Losses (238,617) (238,567)        
Fair Value 1,340,331 1,423,200        
Allowance 0 0        
Securities held to maturity            
Amortized  Cost 563,765 583,453        
Gross Unrealized Gains 408 699        
Gross Unrealized Losses (76,213) (76,688)        
Fair Value 487,960 507,464        
Allowance 71 91 $ 71 $ 94 $ 99 $ 105
Marketable equity securities, amortized cost 15,035 15,035        
Marketable equity securities, gross unrealized gains 0 0        
Marketable equity securities, gross unrealized losses (2,167) (2,179)        
Marketable equity securities, fair value 12,868 12,856        
Amortized  Cost 2,157,344 2,259,684        
Gross Unrealized Gains 812 1,270        
Gross Unrealized Losses (316,997) (317,434)        
Fair Value 1,841,159 1,943,520        
Allowance 71 91        
U.S Treasuries            
Securities available for sale            
Amortized  Cost 7,979 11,972        
Gross Unrealized Gains 2 1        
Gross Unrealized Losses 0 0        
Fair Value 7,981 11,973        
Allowance 0        
Municipal bonds and obligations            
Securities available for sale            
Amortized  Cost 65,840 65,943        
Gross Unrealized Gains 275 422        
Gross Unrealized Losses (2,493) (3,030)        
Fair Value 63,622 63,335        
Allowance 0 0        
Securities held to maturity            
Amortized  Cost 259,843 266,793        
Gross Unrealized Gains 401 691        
Gross Unrealized Losses (21,405) (23,704)        
Fair Value 238,839 243,780        
Allowance 49 66 49 66 67 70
Agency collateralized mortgage obligations            
Securities available for sale            
Amortized  Cost 591,299 631,732        
Gross Unrealized Gains 0 0        
Gross Unrealized Losses (99,959) (99,787)        
Fair Value 491,340 531,945        
Allowance 0 0        
Securities held to maturity            
Amortized  Cost 120,349 128,136        
Gross Unrealized Gains 0 0        
Gross Unrealized Losses (20,469) (20,420)        
Fair Value 99,880 107,716        
Allowance 0 0        
Agency mortgage-backed securities            
Securities available for sale            
Amortized  Cost 611,157 643,308        
Gross Unrealized Gains 0 1        
Gross Unrealized Losses (92,605) (96,996)        
Fair Value 518,552 546,313        
Allowance 0 0        
Securities held to maturity            
Amortized  Cost 49,231 50,958        
Gross Unrealized Gains 0 0        
Gross Unrealized Losses (8,973) (9,240)        
Fair Value 40,258 41,718        
Allowance 0 0        
Agency commercial mortgage-backed securities            
Securities available for sale            
Amortized  Cost 258,283 264,218        
Gross Unrealized Gains 0 0        
Gross Unrealized Losses (38,506) (35,750)        
Fair Value 219,777 228,468        
Allowance 0 0        
Securities held to maturity            
Amortized  Cost 132,320 135,206        
Gross Unrealized Gains 0 0        
Gross Unrealized Losses (25,272) (23,203)        
Fair Value 107,048 112,003        
Allowance 0 0        
Corporate bonds            
Securities available for sale            
Amortized  Cost 43,331 43,368        
Gross Unrealized Gains 60 80        
Gross Unrealized Losses (4,988) (2,938)        
Fair Value 38,403 40,510        
Allowance 0 0        
Tax advantaged economic development bonds            
Securities held to maturity            
Amortized  Cost 1,734 2,069        
Gross Unrealized Gains 7 8        
Gross Unrealized Losses (94) (121)        
Fair Value 1,647 1,956        
Allowance 22 25 $ 22 $ 28 $ 32 $ 35
Other bonds and obligations            
Securities available for sale            
Amortized  Cost 655 655        
Gross Unrealized Gains 67 67        
Gross Unrealized Losses (66) (66)        
Fair Value 656 656        
Allowance 0 0        
Securities held to maturity            
Amortized  Cost 288 291        
Gross Unrealized Gains 0 0        
Gross Unrealized Losses 0 0        
Fair Value 288 291        
Allowance $ 0 $ 0