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Fair Value Measurements Details of Book Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
AFS, at estimated fair value $ 3,084,337 $ 3,062,143
HTM securities 910,156  
Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 2,471,009 1,847,832
FRB and FHLB stock 61,293 92,129
Loans held for sale 43,123 83,886
AFS, at estimated fair value 3,084,337 3,062,143
HTM securities 916,423 278,281
Net Loans 18,012,680 18,623,253
Accrued interest receivable 57,902 72,942
Other financial assets 517,140 650,425
Demand and savings deposits 20,022,870 18,279,358
Brokered deposits 262,617 335,185
Time deposits 1,788,554 2,224,664
Short-term borrowings 468,967 630,066
Accrued interest payable 5,202 10,365
Other financial liabilities 325,361 338,747
FHLB advances and long-term debt 627,386 1,296,263
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 2,471,009 1,847,832
FRB and FHLB stock 61,293 92,129
Loans held for sale 43,123 83,886
AFS, at estimated fair value 3,084,337 3,062,143
HTM securities 910,156 296,857
Net Loans 17,434,206 18,354,532
Accrued interest receivable 57,902 72,942
Other financial assets 517,140 650,425
Demand and savings deposits 20,022,870 18,279,358
Brokered deposits 263,349 336,391
Time deposits 1,795,084 2,246,457
Short-term borrowings 468,967 630,066
Accrued interest payable 5,202 10,365
Other financial liabilities 325,361 338,747
FHLB advances and long-term debt 614,866 1,332,041
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 2,471,009 1,847,832
FRB and FHLB stock 0 0
Loans held for sale 0 0
AFS, at estimated fair value 153,210 0
HTM securities 0 0
Net Loans 0 0
Accrued interest receivable 57,902 72,942
Other financial assets 291,826 279,015
Demand and savings deposits 20,022,870 18,279,358
Brokered deposits 242,617 295,185
Time deposits 0 0
Short-term borrowings 468,967 630,066
Accrued interest payable 5,202 10,365
Other financial liabilities 213,542 156,869
FHLB advances and long-term debt 0 0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 0 0
FRB and FHLB stock 61,293 92,129
Loans held for sale 43,123 83,886
AFS, at estimated fair value 2,855,994 2,963,937
HTM securities 910,156 296,857
Net Loans 0 0
Accrued interest receivable 0 0
Other financial assets 190,480 338,987
Demand and savings deposits 0 0
Brokered deposits 20,732 41,206
Time deposits 1,795,084 2,246,457
Short-term borrowings 0 0
Accrued interest payable 0 0
Other financial liabilities 97,036 167,505
FHLB advances and long-term debt 614,866 1,332,041
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 0 0
FRB and FHLB stock 0 0
Loans held for sale 0 0
AFS, at estimated fair value 75,133 98,206
HTM securities 0 0
Net Loans 17,434,206 18,354,532
Accrued interest receivable 0 0
Other financial assets 34,834 32,423
Demand and savings deposits 0 0
Brokered deposits 0 0
Time deposits 0 0
Short-term borrowings 0 0
Accrued interest payable 0 0
Other financial liabilities 14,783 14,373
FHLB advances and long-term debt $ 0 $ 0