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Fair Value Measurements (Details 7) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and due from banks $ 175,830 $ 233,215    
Interest-earning deposits in financial institutions 209,937 165,222    
Securities available-for-sale, at fair value   3,774,431    
Securities available-for-sale, at fair value 4,009,431 3,774,431    
Federal Home Loan Bank stock, at cost 32,103 20,790    
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure 32,103 20,790    
Loans Receivable Held-for-sale, Amount 0 1,500,000    
Loans and leases, net 17,825,241 16,833,287    
Loans Receivable, Fair Value Disclosure 17,013,860      
Warrants and Rights Outstanding   5,161    
Derivative Asset 3,292 1,873    
Fair Value, Estimate Not Practicable, Equity Method Investments 4,891      
Warrants Not Settleable in Cash, Fair Value Disclosure   5,161    
Deposits, Savings Deposits 16,346,671 15,937,012    
Interest-bearing Domestic Deposit, Brokered 518,192 863,202    
Time Deposits 2,005,638 2,065,322    
Deposits, Fair Value Disclosure 2,017,137 2,055,104    
Borrowings 1,371,114 467,342    
Long-term Debt, Fair Value 1,371,114 467,342    
Subordinated debentures 453,846 462,437    
Subordinated Debt Obligations, Fair Value Disclosure 435,251 444,383    
Derivative Liability 142 1,379    
Loans held for sale, at lower of cost or fair value   481,100    
Loans Held-for-sale, Fair Value Disclosure   483,563    
Level 1        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and due from banks 175,830 233,215    
Interest-earning deposits in financial institutions 209,937 165,222    
Securities available-for-sale, at fair value   5,922    
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 1,371,000 467,000    
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    
Securities available-for-sale, at fair value   3,703,526    
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure 32,103 20,790    
Deposits, Savings Deposits 16,346,671 15,937,012    
Interest-bearing Domestic Deposit, Brokered 518,192 863,202    
Deposits, Fair Value Disclosure 2,017,137 2,055,104    
Long-term Debt, Fair Value 114 342    
Subordinated Debt Obligations, Fair Value Disclosure 435,251 444,383    
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    
Securities available-for-sale, at fair value   64,983    
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure 0 0    
Loans Receivable, Fair Value Disclosure 17,012,060      
Warrants Not Settleable in Cash, Fair Value Disclosure   5,161 $ 5,497 $ 4,914
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 and leases, net   16,833,287    
Loans Receivable, Fair Value Disclosure   17,023,098    
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 1,800 5,143    
NonPCI and PCI Loans [Member] | Level 3        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans Receivable, Fair Value Disclosure   17,017,955    
Fair Value, Measurements, Recurring [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available-for-sale, at fair value 4,009,431 3,774,431    
Derivative Asset, Fair Value of Collateral 3,292 1,873    
Warrants Not Settleable in Cash, Fair Value Disclosure 4,793 5,161    
Derivative Liability, Fair Value of Collateral 142 1,379    
Fair Value, Measurements, Recurring [Member] | Level 1        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available-for-sale, at fair value 403,405 5,922    
Derivative Asset, Fair Value of Collateral 0 0    
Fair Value, Estimate Not Practicable, Equity Method Investments 4,891      
Warrants Not Settleable in Cash, Fair Value Disclosure 0 0    
Derivative Liability, Fair Value of Collateral 0 0    
Fair Value, Measurements, Recurring [Member] | Level 2        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available-for-sale, at fair value 3,558,793 3,703,526    
Derivative Asset, Fair Value of Collateral 3,292 1,873    
Fair Value, Estimate Not Practicable, Equity Method Investments 0      
Warrants Not Settleable in Cash, Fair Value Disclosure 0 0    
Derivative Liability, Fair Value of Collateral 142 1,379    
Fair Value, Measurements, Recurring [Member] | Level 3        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available-for-sale, at fair value 47,233 64,983    
Derivative Asset, Fair Value of Collateral 0 0    
Fair Value, Estimate Not Practicable, Equity Method Investments 0      
Warrants Not Settleable in Cash, Fair Value Disclosure 4,793 5,161    
Derivative Liability, Fair Value of Collateral $ 0 0    
Non Purchased Credit Impaired Loans and Leases [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 1        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans Held-for-sale, Fair Value Disclosure   0    
Non Purchased Credit Impaired Loans and Leases [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 2        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans Held-for-sale, Fair Value Disclosure   483,563    
Non Purchased Credit Impaired Loans and Leases [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 3        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans Held-for-sale, Fair Value Disclosure   $ 0