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Debt Securities - General Disclosures (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Debt securities available for sale      
Amortized Cost $ 3,082,715   $ 4,013,523
Gross Unrealized Gains 2,669   22,382
Gross Unrealized Losses (139,329)   (54,654)
Fair Value 2,946,055   3,981,251
Debt securities held to maturity      
Amortized Cost 976,081    
Gross Unrealized Losses (33,235)    
Fair Value 942,846    
Debt securities available for sale, Amortized Cost      
Due in one year or less 174,918    
Due after one year through five years 456,926    
Due after five years through ten years 313,336    
Due after ten years 2,137,535    
Amortized Cost 3,082,715   4,013,523
Debt securities available for sale, Fair Value      
Due in one year or less 174,182    
Due after one year through five years 441,159    
Due after five years through ten years 303,050    
Due after ten years 2,027,664    
Fair Value 2,946,055   3,981,251
Debt securities held to maturity, Amortized Cost      
Due after one year through five years 48,405    
Due after five years through ten years 66,693    
Due after ten years 860,983    
Amortised cost 976,081    
Debt securities held to maturity, Fair Value      
Due after one year through five years 47,185    
Due after five years through ten years 64,572    
Due after ten years 831,089    
Fair value 942,846    
Realized gains and losses on debt securities      
Gross security gains 113 $ 25  
Gross security (losses) (7)    
Realized net gains (losses) on debt securities 106 $ 25  
Debt securities available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 2,143,296   2,676,734
Continuous unrealized losses existing for greater than 12 months, gross 450,478   106,443
Total, gross 2,593,774   2,783,177
Debt securities available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (96,653)   (49,847)
Continuous unrealized losses existing greater than 12 months, gross (42,676)   (4,807)
Total, gross (139,329)   (54,654)
Debt securities held to maturity, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 693,912    
Continuous unrealized losses existing for greater than 12 months, gross 248,934    
Total, gross 942,846    
Debt securities held to maturity, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (25,269)    
Continuous unrealized losses existing for greater than 12 months, gross (7,966)    
Total, gross (33,235)    
U.S. Treasury securities      
Debt securities available for sale      
Amortized Cost 160,990   166,768
Gross Unrealized Gains 16   41
Gross Unrealized Losses (3,498)   (1,047)
Fair Value 157,508   165,762
Debt securities available for sale, Amortized Cost      
Amortized Cost 160,990   166,768
Debt securities available for sale, Fair Value      
Fair Value 157,508   165,762
Debt securities available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 155,422   163,653
Total, gross 155,422   163,653
Debt securities available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (3,498)   (1,047)
Total, gross (3,498)   (1,047)
Obligations of U.S. government corporations and agencies      
Debt securities available for sale      
Amortized Cost 34,069   37,579
Gross Unrealized Gains 243   891
Gross Unrealized Losses (11)    
Fair Value 34,301   38,470
Debt securities available for sale, Amortized Cost      
Amortized Cost 34,069   37,579
Debt securities available for sale, Fair Value      
Fair Value 34,301   38,470
Debt securities available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 390    
Total, gross 390    
Debt securities available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (11)    
Total, gross (11)    
Obligations of states and political subdivisions      
Debt securities available for sale      
Amortized Cost 308,514   300,602
Gross Unrealized Gains 1,378   7,760
Gross Unrealized Losses (10,300)   (1,493)
Fair Value 299,592   306,869
Debt securities available for sale, Amortized Cost      
Amortized Cost 308,514   300,602
Debt securities available for sale, Fair Value      
Fair Value 299,592   306,869
Debt securities available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 158,528   92,680
Continuous unrealized losses existing for greater than 12 months, gross 9,847    
Total, gross 168,375   92,680
Debt securities available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (9,277)   (1,493)
Continuous unrealized losses existing greater than 12 months, gross (1,023)    
Total, gross (10,300)   (1,493)
Commercial mortgage-backed securities      
Debt securities available for sale      
Amortized Cost 111,535   625,339
Gross Unrealized Gains 30   3,425
Gross Unrealized Losses (4,063)   (13,766)
Fair Value 107,502   614,998
Debt securities held to maturity      
Amortized Cost 503,285    
Gross Unrealized Losses (15,521)    
Fair Value 487,764    
Debt securities available for sale, Amortized Cost      
Amortized Cost 111,535   625,339
Debt securities available for sale, Fair Value      
Fair Value 107,502   614,998
Debt securities available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 87,087   389,078
Continuous unrealized losses existing for greater than 12 months, gross 7,203   85,905
Total, gross 94,290   474,983
Debt securities available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (3,558)   (10,186)
Continuous unrealized losses existing greater than 12 months, gross (505)   (3,580)
Total, gross (4,063)   (13,766)
Debt securities held to maturity, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 281,462    
Continuous unrealized losses existing for greater than 12 months, gross 206,302    
Total, gross 487,764    
Debt securities held to maturity, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (9,329)    
Continuous unrealized losses existing for greater than 12 months, gross (6,192)    
Total, gross (15,521)    
Residential mortgage-backed securities      
Debt securities available for sale      
Amortized Cost 1,678,891   2,095,104
Gross Unrealized Gains 629   8,889
Gross Unrealized Losses (104,144)   (34,680)
Fair Value 1,575,376   2,069,313
Debt securities held to maturity      
Amortized Cost 472,796    
Gross Unrealized Losses (17,714)    
Fair Value 455,082    
Debt securities available for sale, Amortized Cost      
Amortized Cost 1,678,891   2,095,104
Debt securities available for sale, Fair Value      
Fair Value 1,575,376   2,069,313
Debt securities available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 1,054,313   1,700,187
Continuous unrealized losses existing for greater than 12 months, gross 393,830   20,538
Total, gross 1,448,143   1,720,725
Debt securities available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (65,980)   (33,453)
Continuous unrealized losses existing greater than 12 months, gross (38,164)   (1,227)
Total, gross (104,144)   (34,680)
Debt securities held to maturity, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 412,450    
Continuous unrealized losses existing for greater than 12 months, gross 42,632    
Total, gross 455,082    
Debt securities held to maturity, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (15,940)    
Continuous unrealized losses existing for greater than 12 months, gross (1,774)    
Total, gross (17,714)    
Asset-backed securities      
Debt securities available for sale      
Amortized Cost 491,269   492,055
Gross Unrealized Gains 12   295
Gross Unrealized Losses (2,677)   (164)
Fair Value 488,604   492,186
Debt securities available for sale, Amortized Cost      
Amortized Cost 491,269   492,055
Debt securities available for sale, Fair Value      
Fair Value 488,604   492,186
Debt securities available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 470,964   89,983
Total, gross 470,964   89,983
Debt securities available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (2,677)   (164)
Total, gross (2,677)   (164)
Corporate debt securities      
Debt securities available for sale      
Amortized Cost 297,447   296,076
Gross Unrealized Gains 361   1,081
Gross Unrealized Losses (14,636)   (3,504)
Fair Value 283,172   293,653
Debt securities available for sale, Amortized Cost      
Amortized Cost 297,447   296,076
Debt securities available for sale, Fair Value      
Fair Value 283,172   293,653
Debt securities available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 216,592   241,153
Continuous unrealized losses existing for greater than 12 months, gross 39,598    
Total, gross 256,190   241,153
Debt securities available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (11,652)   (3,504)
Continuous unrealized losses existing greater than 12 months, gross (2,984)    
Total, gross $ (14,636)   $ (3,504)