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Investment Securities - Securities with gross unrealized losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months $ 157,205 $ 31,633
Twelve Months or More 282,502 10,522
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 1,104,782 1,316,106
Twelve Months or More 1,145,017 307,277
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 488,272 46,537
Twelve Months or More 465,150 17,261
Securities Available for Sale, Fair Value    
Less Than Twelve Months 3,244,460 2,935,314
Twelve Months or More 1,953,903 462,192
U.S. Treasuries    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 7,358  
Securities Available for Sale, Fair Value    
Less Than Twelve Months 264,425  
U.S. Government agencies    
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 10,903 1,745
Twelve Months or More 19,188 882
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 98,443 86,168
Twelve Months or More 68,727 24,118
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 12,248 529
Twelve Months or More 15,072 1,236
Securities Available for Sale, Fair Value    
Less Than Twelve Months 159,395 73,353
Twelve Months or More 59,228 23,763
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 90,161 18,768
Twelve Months or More 177,344 5,510
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 627,193 868,327
Twelve Months or More 738,063 184,819
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 122,435 17,381
Twelve Months or More 196,035 8,604
Securities Available for Sale, Fair Value    
Less Than Twelve Months 874,957 1,274,934
Twelve Months or More 854,926 221,435
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 34,942 4,937
Twelve Months or More 29,660  
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 265,792 169,240
Twelve Months or More 104,370  
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 35,684 10,911
Twelve Months or More 66,222  
Securities Available for Sale, Fair Value    
Less Than Twelve Months 368,713 432,300
Twelve Months or More 257,017  
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 21,199 4,902
Twelve Months or More 45,167 3,119
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 113,354 154,963
Twelve Months or More 186,507 75,450
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 66,849 13,120
Twelve Months or More 132,795 5,310
Securities Available for Sale, Fair Value    
Less Than Twelve Months 463,425 846,581
Twelve Months or More 528,853 98,106
State and municipal obligations    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 223,328 1,867
Twelve Months or More 29,422 352
Securities Available for Sale, Fair Value    
Less Than Twelve Months 917,487 123,987
Twelve Months or More 75,275 8,579
Small Business Administration loan-backed securities    
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months   1,281
Twelve Months or More 11,143 1,011
Securities Held to Maturity, Fair Value    
Less Than Twelve Months   37,408
Twelve Months or More 47,350 22,890
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 18,118 2,720
Twelve Months or More 25,604 1,759
Securities Available for Sale, Fair Value    
Less Than Twelve Months 167,715 179,168
Twelve Months or More 178,604 110,309
Corporate securities.    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 2,252 9
Securities Available for Sale, Fair Value    
Less Than Twelve Months $ 28,343 $ 4,991