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SECURITIES (Schedule of Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Schedule of Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost, Total $ 2,617,986 $ 2,729,980
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,073 2,074
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 374,120 358,271
Debt Securities, Available-for-Sale 2,244,939 2,373,783
Held-to-maturity Securities, Amortized Cost 1,038,634 1,059,387
Held-to-maturity Securities, Gross Unrealized Gains 81 687
Held-to-maturity Securities, Gross Unrealized Losses 169,296 152,228
Securities—held-to-maturity 869,097 907,514
Allowance for Credit Losses (322) (332)
debt securities, held-to-maturity, accrued interest receivable 3,900 4,500
Debt Securities, Available-for-Sale, Accrued Interest Receivable 10,700 10,800
U.S. Government and agency obligations    
Schedule of Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost, Total 9,569 34,929
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 676 740
Debt Securities, Available-for-Sale 8,893 34,189
Held-to-maturity Securities, Amortized Cost 306 307
Held-to-maturity Securities, Gross Unrealized Gains 0 0
Held-to-maturity Securities, Gross Unrealized Losses 6 5
Securities—held-to-maturity 300 302
Allowance for Credit Losses 0 0
Municipal bonds    
Schedule of Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost, Total 155,850 161,264
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 600 832
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 29,441 29,191
Debt Securities, Available-for-Sale 127,009 132,905
Held-to-maturity Securities, Amortized Cost 451,091 466,032
Held-to-maturity Securities, Gross Unrealized Gains 81 687
Held-to-maturity Securities, Gross Unrealized Losses 59,467 53,563
Securities—held-to-maturity 391,553 412,999
Allowance for Credit Losses (152) 157
Corporate bonds    
Schedule of Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost, Total 131,311 131,291
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 120 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 11,990 12,168
Debt Securities, Available-for-Sale 119,441 119,123
Held-to-maturity Securities, Amortized Cost 2,749 2,781
Held-to-maturity Securities, Gross Unrealized Gains 0 0
Held-to-maturity Securities, Gross Unrealized Losses 19 20
Securities—held-to-maturity 2,560 2,586
Allowance for Credit Losses (170) 175
Mortgage-backed or related securities    
Schedule of Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost, Total 2,108,139 2,179,947
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 118 942
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 331,872 314,175
Debt Securities, Available-for-Sale 1,776,385 1,866,714
Held-to-maturity Securities, Amortized Cost 584,488 590,267
Held-to-maturity Securities, Gross Unrealized Gains 0 0
Held-to-maturity Securities, Gross Unrealized Losses 109,804 98,640
Securities—held-to-maturity 474,684 491,627
Allowance for Credit Losses 0 0
Asset-backed securities    
Schedule of Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost, Total 213,117 222,549
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 235 300
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 141 1,997
Debt Securities, Available-for-Sale $ 213,211 $ 220,852