XML 51 R40.htm IDEA: XBRL DOCUMENT v3.22.2
INVESTMENT SECURITIES - Available-for-Sale Portfolio (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Available-for-Sale Portfolio [Abstract]    
Amortized cost $ 6,255,259 $ 4,980,102
Gross unrealized gains 2,793 65,387
Gross unrealized losses 667,625 111,279
Available-for-sale investment securities 5,590,427 4,934,210
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized cost 6,255,259 4,980,102
Debt Securities, Available-for-sale 5,590,427 4,934,210
U.S. Treasury and Agency Securities    
Available-for-Sale Portfolio [Abstract]    
Amortized cost 5,199,745 4,064,624
Available-for-sale investment securities 4,615,546 3,998,564
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized cost 5,199,745 4,064,624
Gross unrealized gains 165 39,997
Gross unrealized losses 584,364 106,057
Debt Securities, Available-for-sale 4,615,546 3,998,564
Obligations of State and Political Subdivisions    
Available-for-Sale Portfolio [Abstract]    
Amortized cost 565,701 413,019
Available-for-sale investment securities 527,155 430,289
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized cost 565,701 413,019
Gross unrealized gains 2,224 17,326
Gross unrealized losses 40,770 56
Debt Securities, Available-for-sale 527,155 430,289
Government Agency Mortgage-Backed Securities    
Available-for-Sale Portfolio [Abstract]    
Amortized cost 466,276 474,506
Available-for-sale investment securities 425,357 477,056
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized cost 466,276 474,506
Gross unrealized gains 397 7,615
Gross unrealized losses 41,316 5,065
Debt Securities, Available-for-sale 425,357 477,056
Corporate debt securities    
Available-for-Sale Portfolio [Abstract]    
Amortized cost 8,000 8,000
Available-for-sale investment securities 7,231 7,962
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized cost 8,000 8,000
Gross unrealized gains 0 39
Gross unrealized losses 769 77
Debt Securities, Available-for-sale 7,231 7,962
Government Agency Collateralized Mortgage Obligations    
Available-for-Sale Portfolio [Abstract]    
Amortized cost 15,537 19,953
Available-for-sale investment securities 15,138 20,339
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized cost 15,537 19,953
Gross unrealized gains 7 410
Gross unrealized losses 406 24
Debt Securities, Available-for-sale 15,138 20,339
Federal Reserve Bank Stock [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Gross unrealized losses 0 0
Other Equity Securities [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Gross unrealized losses 0 0
Federal Home Loan Bank Common Stock [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Gross unrealized losses $ 0 $ 0