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SECURITIES (Schedule of Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Schedule of Securities [Line Items]    
Debt Securities, Trading, Amortized Cost $ 27,203 $ 27,203
Securities—trading 25,659 28,694
Debt Securities, Available-for-sale, Amortized Cost, Total 2,879,179 3,218,777
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 533 1,463
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 411,752 431,209
Debt Securities, Available-for-sale, Allowance for Credit Loss (2,000) 0
Securities—available-for-sale, net of allowance for credit losses of $2,000 and none, respectively; amortized cost $2,879,179 and $3,218,777, respectively 2,465,960 2,789,031
Held-to-maturity Securities, Gross Unrealized Gains 105 109
Held-to-maturity Securities, Gross Unrealized Losses 165,559 175,896
Securities—held-to-maturity 933,116 942,180
Allowance for Credit Losses (355) (379)
debt securities, held-to-maturity, accrued interest receivable 4,700 4,800
Debt Securities, Available-for-Sale, Accrued Interest Receivable 11,100 12,400
Debt Securities, Held-to-Maturity, Amortized Cost, Gross   1,117,967
Debt Securities, Held-to-Maturity, Amortized Cost, Net 1,098,925  
U.S. Government and agency obligations    
Schedule of Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost, Total 49,471 56,344
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 14 8
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 1,123 1,244
Debt Securities, Available-for-sale, Allowance for Credit Loss 0  
Securities—available-for-sale, net of allowance for credit losses of $2,000 and none, respectively; amortized cost $2,879,179 and $3,218,777, respectively 48,362 55,108
Held-to-maturity Securities, Gross Unrealized Gains 0 0
Held-to-maturity Securities, Gross Unrealized Losses 7 7
Securities—held-to-maturity 302 305
Allowance for Credit Losses 0 0
Debt Securities, Held-to-Maturity, Amortized Cost, Gross   312
Debt Securities, Held-to-Maturity, Amortized Cost, Net 309  
Municipal bonds    
Schedule of Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost, Total 194,660 301,449
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 181 530
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 34,073 40,770
Debt Securities, Available-for-sale, Allowance for Credit Loss 0  
Securities—available-for-sale, net of allowance for credit losses of $2,000 and none, respectively; amortized cost $2,879,179 and $3,218,777, respectively 160,768 261,209
Held-to-maturity Securities, Gross Unrealized Gains 105 109
Held-to-maturity Securities, Gross Unrealized Losses 62,883 70,907
Securities—held-to-maturity 434,598 432,319
Allowance for Credit Losses (170) 183
Debt Securities, Held-to-Maturity, Amortized Cost, Gross   503,117
Debt Securities, Held-to-Maturity, Amortized Cost, Net 497,546  
Corporate bonds    
Schedule of Securities [Line Items]    
Debt Securities, Trading, Amortized Cost 27,203 27,203
Securities—trading 25,659 28,694
Debt Securities, Available-for-sale, Amortized Cost, Total 118,160 133,334
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 16,372 11,481
Debt Securities, Available-for-sale, Allowance for Credit Loss (2,000)  
Securities—available-for-sale, net of allowance for credit losses of $2,000 and none, respectively; amortized cost $2,879,179 and $3,218,777, respectively 99,788 121,853
Held-to-maturity Securities, Gross Unrealized Gains 0 0
Held-to-maturity Securities, Gross Unrealized Losses 24 16
Securities—held-to-maturity 2,635 2,945
Allowance for Credit Losses (185) 196
Debt Securities, Held-to-Maturity, Amortized Cost, Gross   2,961
Debt Securities, Held-to-Maturity, Amortized Cost, Net 2,844  
Mortgage-backed or related securities    
Schedule of Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost, Total 2,294,371 2,505,172
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 275 885
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 352,248 366,721
Debt Securities, Available-for-sale, Allowance for Credit Loss 0  
Securities—available-for-sale, net of allowance for credit losses of $2,000 and none, respectively; amortized cost $2,879,179 and $3,218,777, respectively 1,942,398 2,139,336
Held-to-maturity Securities, Gross Unrealized Gains 0 0
Held-to-maturity Securities, Gross Unrealized Losses 102,645 104,966
Securities—held-to-maturity 495,581 506,611
Allowance for Credit Losses 0 0
Debt Securities, Held-to-Maturity, Amortized Cost, Gross   611,577
Debt Securities, Held-to-Maturity, Amortized Cost, Net 598,226  
Asset-backed securities    
Schedule of Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost, Total 222,517 222,478
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 63 40
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 7,936 10,993
Debt Securities, Available-for-sale, Allowance for Credit Loss 0  
Securities—available-for-sale, net of allowance for credit losses of $2,000 and none, respectively; amortized cost $2,879,179 and $3,218,777, respectively $ 214,644 $ 211,525