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INVESTMENT SECURITIES - Amortized Cost and Fair Value of Available for Sale Securities and Held to Maturity Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Amortized Cost    
Due in one year or less $ 3,066 $ 2,822
Due after one through five years 26,885 11,694
Due after five through ten years 102,618 169,729
Due after ten years 1,231,996 1,480,472
Total debt securities with a single maturity date 1,364,565 1,664,717
Total investment securities 1,921,167 2,273,347
Fair Value    
Due in one year or less 3,028 2,809
Due after one through five years 24,963 11,265
Due after five through ten years 95,285 161,211
Due after ten years 1,068,299 1,293,103
Total debt securities with a single maturity date 1,191,575 1,468,388
Total investment securities 1,651,362 1,976,661
Amortized Cost    
Due in one year or less 11,816 13,697
Due after one through five years 113,862 80,697
Due after five through ten years 130,552 147,078
Due after ten years 1,238,540 1,269,826
Total debt securities with a single maturity date 1,494,770 1,511,298
Total investment securities 2,240,374 2,287,372
Fair Value    
Due in one year or less 11,804 13,749
Due after one through five years 105,028 76,453
Due after five through ten years 120,674 135,027
Due after ten years 1,007,764 1,020,477
Total debt securities with a single maturity date 1,245,270 1,245,706
Total investment securities 1,880,683 1,907,865
U.S. Government-sponsored mortgage-backed securities    
Amortized Cost    
U.S. Government-sponsored mortgage-backed securities 556,602 608,630
Fair Value    
U.S. Government-sponsored mortgage-backed securities 459,787 508,273
Total investment securities 459,787 508,273
Amortized Cost    
U.S. Government-sponsored mortgage-backed securities 745,604 776,074
Total investment securities 745,604 776,074
Fair Value    
U.S. Government-sponsored mortgage-backed securities 635,413 662,159
Total investment securities $ 635,413 $ 662,159