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Investment Securities, AFS and HTM Securities Amortized Costs and Fair Values (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities, Amortized Cost Basis, Total $ 3,282,290 $ 3,028,399
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 45,566 60,612
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (4,509) (3,570)
Available-for-sale Securities 3,323,346 3,085,441
Investment securities HTM    
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss 1,799,893 1,879,005
Held-to-maturity, Gross Unrealized Gains 131,430 149,938
Held-to-maturity, Gross Unrealized Loss (781) 0
Held-to-maturity, Fair Value 1,930,541 2,028,943
Fair Value, Inputs, Level 2    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities 3,198,813 3,058,910
Investment securities HTM    
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss 1,798,835 1,877,939
Held-to-maturity, Fair Value 1,929,470 2,027,852
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Other Debt securities    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities 3,000 3,000
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | US Government-sponsored Enterprises Debt Securities [Member]    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities 7,573 8,584
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities 215,464 327,189
Fair Value, Inputs, Level 1    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities 124,533 26,531
FNMA/FHLMC | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Residential Related Securities    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities 2,057,909 1,461,241
FNMA/FHLMC | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Commercial mortgage-related securities    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities 95,708 22,904
Government National Mortgage Association (GNMA) [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Residential Related Securities    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities 93,967 235,537
Government National Mortgage Association (GNMA) [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Commercial mortgage-related securities    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities 289,593 524,756
US Treasury Securities [Member]    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities, Amortized Cost Basis, Total 124,216 26,436
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 498 95
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (181) 0
Investment securities HTM    
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss 1,000 999
Held-to-maturity, Gross Unrealized Gains 13 25
Held-to-maturity, Gross Unrealized Loss 0 0
Held-to-maturity, Fair Value 1,013 1,024
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities   26,531
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities 124,533 26,531
Agency Securities    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities, Amortized Cost Basis, Total 15,000 24,985
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0 53
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (9) 0
Agency Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities 14,991 25,038
US States and Political Subdivisions Debt Securities [Member]    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities, Amortized Cost Basis, Total 398,617 425,057
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 21,992 25,605
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0 0
Investment securities HTM    
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss 1,479,375 1,441,900
Held-to-maturity, Gross Unrealized Gains 121,908 133,544
Held-to-maturity, Gross Unrealized Loss (190) 0
Held-to-maturity, Fair Value 1,601,093 1,575,445
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities 420,609 450,662
Residential Related Securities | FNMA/FHLMC    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities, Amortized Cost Basis, Total 2,049,513 1,448,806
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 11,681 12,935
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (3,285) (500)
Available-for-sale Securities 2,057,909  
Investment securities HTM    
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss 41,505 54,599
Held-to-maturity, Gross Unrealized Gains 2,151 2,891
Held-to-maturity, Gross Unrealized Loss 0 0
Held-to-maturity, Fair Value 43,656 57,490
Residential Related Securities | Government National Mortgage Association (GNMA) [Member]    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities, Amortized Cost Basis, Total 90,956 231,364
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 3,011 4,176
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0 (3)
Available-for-sale Securities 93,967  
Investment securities HTM    
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss 66,979 114,553
Held-to-maturity, Gross Unrealized Gains 2,618 4,260
Held-to-maturity, Gross Unrealized Loss 0 0
Held-to-maturity, Fair Value 69,597 118,813
Commercial mortgage-related securities | FNMA/FHLMC    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities, Amortized Cost Basis, Total 93,693 19,654
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 2,647 3,250
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (632) 0
Available-for-sale Securities 95,708  
Investment securities HTM    
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss 63,668 11,211
Held-to-maturity, Gross Unrealized Gains 515 0
Held-to-maturity, Gross Unrealized Loss (591) 0
Held-to-maturity, Fair Value 63,591 11,211
Commercial mortgage-related securities | Government National Mortgage Association (GNMA) [Member]    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities, Amortized Cost Basis, Total 284,815 511,429
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 4,777 13,327
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0 0
Available-for-sale Securities 289,593  
Investment securities HTM    
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss 147,366 255,742
Held-to-maturity, Gross Unrealized Gains 4,225 9,218
Held-to-maturity, Gross Unrealized Loss 0 0
Held-to-maturity, Fair Value 151,591 264,960
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities, Amortized Cost Basis, Total 214,904 329,030
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 914 1,172
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (354) (3,013)
Available-for-sale Securities 215,464  
Investment securities HTM    
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss 0  
Held-to-maturity, Fair Value 0  
US Government-sponsored Enterprises Debt Securities [Member]    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities, Amortized Cost Basis, Total 7,575 8,637
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 46 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (48) (53)
Available-for-sale Securities 7,573  
Investment securities HTM    
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss 0  
Held-to-maturity, Fair Value 0  
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities   8,584
Other Debt securities    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities, Amortized Cost Basis, Total 3,000 3,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax $ 0 $ 0