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Fair Value Measurements Details of Book Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
AFS, at estimated fair value $ 2,778,838 $ 3,187,390
HTM securities 1,215,325 965,867
Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 449,674 1,638,614
FRB and FHLB stock 62,146 57,635
Federal funds sold 30,500  
Loans held for sale 17,528 35,768
AFS, at estimated fair value 2,778,838 3,187,390
HTM securities 1,338,963 980,384
Net Loans 18,672,386 18,076,349
Accrued interest receivable 64,457 57,451
Other financial assets 505,136 565,491
Demand and savings deposits 19,340,633 19,594,497
Brokered deposits 243,172 251,526
Time deposits 1,560,061 1,727,476
Accrued interest payable 6,010 7,000
Short-term borrowings 456,185 416,764
FHLB advances and long-term debt 557,130 621,345
Other financial liabilities 343,794 288,862
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 449,674 1,638,614
FRB and FHLB stock 62,146 57,635
Federal funds sold 30,500  
Loans held for sale 17,528 35,768
AFS, at estimated fair value 2,778,838 3,187,390
HTM securities 1,215,325 965,867
Net Loans 17,993,585 17,519,497
Accrued interest receivable 64,457 57,451
Other financial assets 505,136 565,491
Demand and savings deposits 19,340,633 19,594,497
Brokered deposits 243,339 252,129
Time deposits 1,552,555 1,730,673
Accrued interest payable 6,010 7,000
Short-term borrowings 456,185 416,764
FHLB advances and long-term debt 490,331 605,719
Other financial liabilities 343,794 288,862
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 449,674 1,638,614
FRB and FHLB stock 0 0
Federal funds sold 30,500  
Loans held for sale 0 0
AFS, at estimated fair value 371,266 127,618
HTM securities 0 0
Net Loans 0 0
Accrued interest receivable 64,457 57,451
Other financial assets 357,501 367,336
Demand and savings deposits 19,340,633 19,594,497
Brokered deposits 223,172 231,526
Time deposits 0 0
Accrued interest payable 6,010 7,000
Short-term borrowings 456,185 416,764
FHLB advances and long-term debt 0 0
Other financial liabilities 161,198 188,219
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 62,146 57,635
Federal funds sold 0  
Loans held for sale 17,528 35,768
AFS, at estimated fair value 2,407,572 2,985,105
HTM securities 1,215,325 965,867
Net Loans 0 0
Accrued interest receivable 0 0
Other financial assets 93,045 160,945
Demand and savings deposits 0 0
Brokered deposits 20,167 20,603
Time deposits 1,552,555 1,730,673
Accrued interest payable 0 0
Short-term borrowings 0 0
FHLB advances and long-term debt 490,331 605,719
Other financial liabilities 168,272 86,110
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
Federal funds sold 0  
Loans held for sale 0 0
AFS, at estimated fair value 0 74,667
HTM securities 0 0
Net Loans 17,993,585 17,519,497
Accrued interest receivable 0 0
Other financial assets 54,590 37,210
Demand and savings deposits 0 0
Brokered deposits 0 0
Time deposits 0 0
Accrued interest payable 0 0
Short-term borrowings 0 0
FHLB advances and long-term debt 0 0
Other financial liabilities $ 14,324 $ 14,533