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Borrowed Funds - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Mar. 31, 2015
Jun. 30, 2014
Dec. 31, 2018
Dec. 31, 2017
Borrowed Funds [Line Items]        
Carrying value of securities pledged     $ 3,300 $ 7,500
Unregistered multi tranche debt Transactions   $ 245,000    
Unregistered debt transactions $ 50,000      
Subordinated debt     $ 98,910 98,687
Subordinate debt capital treatment achievement period     10 years  
FHLB advances     $ 150,000 150,000
Irrevocable letter of credit     590,000 386,500
FRB        
Borrowed Funds [Line Items]        
Borrowings from FRB     0 0
Public Fund Treasury Management Deposit        
Borrowed Funds [Line Items]        
Irrevocable letter of credit     555,000  
Commercial Loans | FRB        
Borrowed Funds [Line Items]        
Collateralized borrowings from FRB     740,300  
Commercial and Residential Real Estate Loan        
Borrowed Funds [Line Items]        
FHLB advances collateral amount     $ 1,600,000 $ 1,600,000
4.875% Senior Notes, Due June 28, 2019        
Borrowed Funds [Line Items]        
Subordinated debt maturity period     4 years  
5.375% Senior Notes, Due June 28, 2021        
Borrowed Funds [Line Items]        
Subordinated debt maturity period     7 years  
7.250% Subordinated Notes, Due June 28, 2029, Callable in 2024        
Borrowed Funds [Line Items]        
Subordinated debt maturity period     15 years  
Subordinated debt     $ 35,000  
Call option period     10 years  
6.250% Subordinated Notes, Due June 28, 2029, Callable in 2024        
Borrowed Funds [Line Items]        
Subordinated debt maturity period     15 years  
Subordinated debt     $ 25,000  
Call option period     10 years  
6.500% Subordinated Notes, Due March 2025, Callable in 2020        
Borrowed Funds [Line Items]        
Subordinated debt     $ 40,000  
Call option period     5 years  
Expiration on September 28, 2020 | SAFE Program Deposits        
Borrowed Funds [Line Items]        
Irrevocable letter of credit     $ 35,000  
Letter of credit expiration date     Sep. 28, 2020  
Letter of credit expiration period     45 days  
Letter of credit extended expiration term     1 year  
Expiration on January 2019 | Public Fund Treasury Management Deposit        
Borrowed Funds [Line Items]        
Irrevocable letter of credit     $ 205,000  
Letter of credit expiration date     Jan. 31, 2019  
Letter of credit expiration period     45 days  
Letter of credit extended expiration term     1 year  
Expiration on May 26, 2021 | Public Fund Treasury Management Deposit        
Borrowed Funds [Line Items]        
Irrevocable letter of credit     $ 350,000  
Letter of credit expiration date     May 26, 2021  
Letter of credit expiration period     45 days  
Letter of credit extended expiration term     1 year  
Minimum        
Borrowed Funds [Line Items]        
Repurchase agreement maturity period     one day  
Maximum        
Borrowed Funds [Line Items]        
Repurchase agreement maturity period     seven days