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Fair Value Measurements (Details 8) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and due from banks $ 172,585 $ 175,830    
Interest-earning deposits in financial institutions 465,039 209,937    
Securities available-for-sale, at fair value 3,797,187 4,009,431    
Securities available-for-sale, at fair value 3,797,187 4,009,431    
Federal Home Loan Bank stock, at cost 40,924 32,103    
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure 40,924 32,103    
Loans and leases, net 18,708,087 17,825,241    
Loans Receivable, Fair Value Disclosure 19,055,004      
Warrants and Rights Outstanding   4,793    
Derivative Asset 1,234 3,292    
Equity Securities, FV-NI 2,998 4,891    
Deposits, Savings Deposits 16,187,287 16,346,671    
Interest-bearing Domestic Deposit, Brokered 496,407 518,192    
Time Deposits 2,549,342 2,005,638    
Deposits, Fair Value Disclosure 2,549,260 2,017,137    
Borrowings 1,759,008 1,371,114    
Long-term Debt, Fair Value 1,759,008 1,371,114    
Subordinated debentures 458,209 453,846    
Subordinated Debt Obligations, Fair Value Disclosure 441,617 435,251    
Derivative Liability 755 142    
Level 1        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and due from banks 172,585 175,830    
Interest-earning deposits in financial institutions 465,039 209,937    
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure 0 0    
Deposits, Savings Deposits 0 0    
Interest-bearing Domestic Deposit, Brokered 0 0    
Deposits, Fair Value Disclosure 0 0    
Long-term Debt, Fair Value 1,759,000 1,371,000    
Subordinated Debt Obligations, Fair Value Disclosure 0 0    
Level 2        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and due from banks 0 0    
Interest-earning deposits in financial institutions 0 0    
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure 40,924 32,103    
Deposits, Savings Deposits 16,187,287 16,346,671    
Interest-bearing Domestic Deposit, Brokered 496,407 518,192    
Deposits, Fair Value Disclosure 2,549,260 2,017,137    
Long-term Debt, Fair Value 8 114    
Subordinated Debt Obligations, Fair Value Disclosure 441,617 435,251    
Level 3        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and due from banks 0 0    
Interest-earning deposits in financial institutions 0 0    
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure 0 0    
Loans Receivable, Fair Value Disclosure 19,053,921      
Warrants Not Settleable in Cash, Fair Value Disclosure   4,793 $ 5,161 $ 5,497
Deposits, Savings Deposits 0 0    
Interest-bearing Domestic Deposit, Brokered 0 0    
Deposits, Fair Value Disclosure 0 0    
Long-term Debt, Fair Value 0 0    
Subordinated Debt Obligations, Fair Value Disclosure 0 0    
NonPCI and PCI Loans [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans Receivable, Fair Value Disclosure   17,013,860    
NonPCI and PCI Loans [Member] | Level 1        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans Receivable, Fair Value Disclosure 0 0    
NonPCI and PCI Loans [Member] | Level 2        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans Receivable, Fair Value Disclosure 1,083 1,800    
NonPCI and PCI Loans [Member] | Level 3        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans Receivable, Fair Value Disclosure   17,012,060    
Fair Value, Recurring        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available-for-sale, at fair value 3,797,187      
Derivative Asset, Fair Value of Collateral 1,234 3,292    
Warrants Not Settleable in Cash, Fair Value Disclosure 3,434 4,793    
Derivative Liability, Fair Value of Collateral 755 142    
Fair Value, Recurring | Level 1        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available-for-sale, at fair value 5,181 403,405    
Derivative Asset, Fair Value of Collateral 0 0    
Equity Securities, FV-NI 2,998 4,891    
Warrants Not Settleable in Cash, Fair Value Disclosure 0 0    
Derivative Liability, Fair Value of Collateral 0 0    
Fair Value, Recurring | Level 2        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available-for-sale, at fair value 3,769,307 3,558,793    
Derivative Asset, Fair Value of Collateral 1,234 3,292    
Equity Securities, FV-NI 0 0    
Warrants Not Settleable in Cash, Fair Value Disclosure 0 0    
Derivative Liability, Fair Value of Collateral 755 142    
Fair Value, Recurring | Level 3        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available-for-sale, at fair value 22,699 47,233    
Derivative Asset, Fair Value of Collateral 0 0    
Equity Securities, FV-NI 0 0    
Warrants Not Settleable in Cash, Fair Value Disclosure 3,434 4,793    
Derivative Liability, Fair Value of Collateral $ 0 $ 0