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Borrowed Funds - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
Mar. 31, 2015
Jun. 30, 2014
Mar. 31, 2019
Mar. 29, 2019
Dec. 31, 2018
Borrowed Funds [Line Items]          
Carrying value of securities pledged     $ 3,200,000   $ 3,300,000
Unregistered multi tranche debt Transactions   $ 245,000,000      
Unregistered debt transactions $ 50,000,000        
Subordinated debt     $ 98,963,000   98,910,000
Subordinate debt capital treatment achievement period     10 years    
FHLB advances     $ 395,000,000   150,000,000
Irrevocable letter of credit     445,000,000   590,000,000
Holding Company Revolving Loan Facility | Revolving Credit Facility          
Borrowed Funds [Line Items]          
Borrowings from FRB     0    
Line of credit facility, borrowing capacity       $ 100,000,000  
FRB          
Borrowed Funds [Line Items]          
Borrowings from FRB     0   $ 0
Public Fund Treasury Management Deposit          
Borrowed Funds [Line Items]          
Irrevocable letter of credit     410,000,000    
Commercial Loans | FRB          
Borrowed Funds [Line Items]          
Collateralized borrowings from FRB     802,700,000    
Investment Securities and Commercial and Residential Real Estate Loan          
Borrowed Funds [Line Items]          
FHLB advances collateral amount     $ 2,200,000,000    
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     $ 35,000,000    
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     $ 25,000,000    
Call option period     10 years    
6.500% Subordinated Notes, Due March 2025, Callable in 2020          
Borrowed Funds [Line Items]          
Subordinated debt     $ 40,000,000    
Call option period     5 years    
Expiration on September 28, 2020 | SAFE Program Deposits          
Borrowed Funds [Line Items]          
Irrevocable letter of credit     $ 35,000,000    
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 April 2019 | Public Fund Treasury Management Deposit          
Borrowed Funds [Line Items]          
Irrevocable letter of credit     $ 60,000,000    
Letter of credit expiration date     Apr. 30, 2019    
Expiration on May 26, 2021 | Public Fund Treasury Management Deposit          
Borrowed Funds [Line Items]          
Irrevocable letter of credit     $ 350,000,000    
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    
Maximum          
Borrowed Funds [Line Items]          
Repurchase agreement maturity period     seven days