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Securities - Schedule of Fair Value of Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Available for sale    
Amortized Cost $ 1,033,128 $ 1,137,702
Gross Unrealized Gains 320 335
Gross Unrealized Losses (127,635) (140,479)
Fair Value 905,813 997,558
Held to maturity    
Amortized Cost 1,983,496 2,022,748
Gross Unrealized Gains 514 374
Gross Unrealized Losses (315,781) (341,813)
Fair Value 1,668,229 1,681,309
U.S. Treasury and federal agencies    
Available for sale    
Amortized Cost 294,640 294,329
Gross Unrealized Gains 0 0
Gross Unrealized Losses (25,805) (27,150)
Fair Value 268,835 267,179
Held to maturity    
Amortized Cost 287,576 295,250
Gross Unrealized Gains 0 0
Gross Unrealized Losses (45,929) (49,237)
Fair Value 241,647 246,013
State and municipal    
Available for sale    
Amortized Cost 425,815 505,006
Gross Unrealized Gains 6 140
Gross Unrealized Losses (61,755) (71,602)
Fair Value 364,066 433,544
Held to maturity    
Amortized Cost 1,110,945 1,127,669
Gross Unrealized Gains 514 374
Gross Unrealized Losses (173,391) (192,458)
Fair Value 938,068 935,585
Federal agency collateralized mortgage obligations    
Available for sale    
Amortized Cost 24,529 33,011
Gross Unrealized Gains 0 0
Gross Unrealized Losses (1,634) (1,796)
Fair Value 22,895 31,215
Held to maturity    
Amortized Cost 54,067 56,564
Gross Unrealized Gains 0 0
Gross Unrealized Losses (8,601) (8,865)
Fair Value 45,466 47,699
Federal agency mortgage-backed pools    
Available for sale    
Amortized Cost 206,240 220,963
Gross Unrealized Gains 0 0
Gross Unrealized Losses (28,586) (30,307)
Fair Value 177,654 190,656
Held to maturity    
Amortized Cost 333,767 343,953
Gross Unrealized Gains 0 0
Gross Unrealized Losses (53,147) (56,714)
Fair Value 280,620 287,239
Private labeled mortgage-backed pools    
Held to maturity    
Amortized Cost 33,848 35,466
Gross Unrealized Gains 0 0
Gross Unrealized Losses (5,186) (5,493)
Fair Value 28,662 29,973
Corporate notes    
Available for sale    
Amortized Cost 81,904 84,393
Gross Unrealized Gains 314 195
Gross Unrealized Losses (9,855) (9,624)
Fair Value 72,363 74,964
Held to maturity    
Amortized Cost 163,293 163,846
Gross Unrealized Gains 0 0
Gross Unrealized Losses (29,527) (29,046)
Fair Value $ 133,766 $ 134,800