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Investment Securities - Securities with gross unrealized losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months $ 181,534 $ 31,633
Twelve Months or More 132,245 10,522
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 1,692,757 1,316,106
Twelve Months or More 799,929 307,277
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 526,035 46,537
Twelve Months or More 129,473 17,261
Securities Available for Sale, Fair Value    
Less Than Twelve Months 4,624,619 2,935,314
Twelve Months or More 757,028 462,192
U.S. Treasuries    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 4,290  
Securities Available for Sale, Fair Value    
Less Than Twelve Months 266,868  
U.S. Government agencies    
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 11,007 1,745
Twelve Months or More 7,994 882
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 136,264 86,168
Twelve Months or More 41,995 24,118
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 13,255 529
Twelve Months or More 4,574 1,236
Securities Available for Sale, Fair Value    
Less Than Twelve Months 182,661 73,353
Twelve Months or More 20,426 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 108,991 18,768
Twelve Months or More 82,311 5,510
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 982,694 868,327
Twelve Months or More 511,698 184,819
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 156,740 17,381
Twelve Months or More 63,890 8,604
Securities Available for Sale, Fair Value    
Less Than Twelve Months 1,495,239 1,274,934
Twelve Months or More 364,307 221,435
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 31,871 4,937
Twelve Months or More 9,814  
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 401,276 169,240
Twelve Months or More 51,369  
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 48,241 10,911
Twelve Months or More 16,863  
Securities Available for Sale, Fair Value    
Less Than Twelve Months 583,880 432,300
Twelve Months or More 82,614  
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 29,665 4,902
Twelve Months or More 23,456 3,119
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 172,523 154,963
Twelve Months or More 144,331 75,450
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 118,072 13,120
Twelve Months or More 25,821 5,310
Securities Available for Sale, Fair Value    
Less Than Twelve Months 884,401 846,581
Twelve Months or More 134,664 98,106
State and municipal obligations    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 162,460 1,867
Twelve Months or More 8,676 352
Securities Available for Sale, Fair Value    
Less Than Twelve Months 978,854 123,987
Twelve Months or More 31,063 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 8,670 1,011
Securities Held to Maturity, Fair Value    
Less Than Twelve Months   37,408
Twelve Months or More 50,536 22,890
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 21,967 2,720
Twelve Months or More 9,649 1,759
Securities Available for Sale, Fair Value    
Less Than Twelve Months 208,617 179,168
Twelve Months or More 123,954 110,309
Corporate securities.    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 1,010 9
Securities Available for Sale, Fair Value    
Less Than Twelve Months $ 24,099 $ 4,991