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Fair value (Estimated fair value and carrying value) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Assets, Fair Value Disclosure [Abstract]        
Available-for-sale Securities $ 974,609 $ 1,216,538    
Held to maturity Fair Value 614,679 164,154    
Federal Home Loan Bank (FHLB) stock 20,783 21,169    
Other Investments 3 3    
Derivative Assets 3,025 8,107    
Servicing Assets 7,455 13,992 $ 13,801 $ 10,795
Liabilities, Fair Value Disclosure [Abstract]        
Derivative liabilities 6,162 11,221    
Assets,Carrying Value [Abstract]        
Total cash and cash equivalents 536,709 573,427 621,269  
Restricted Cash And Cash Equivalents 3,349 8,407    
Trading Securities 288 1,594    
Loans, net of allowance for loan and lease losses 4,416,396 4,807,825    
FDIC Indemnification Asset 22,599 97,378 $ 189,240 $ 302,295
Accrued interest receivable 20,637 21,345    
Liabilities,Carrying Value Disclosure [Abstract]        
Deposits, Total 4,716,859 4,924,406    
Securities Sold under Agreements to Repurchase 934,691 980,087    
Subordinated capital notes 102,633 101,584    
Securities Purchased But Not Yet Received 0 0    
Accrued expenses and other liabilities 92,935 133,290    
Fair Value, Inputs, Level 1 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Cash and Cash Equivalents, Fair Value Disclosure 536,709 573,427    
Restricted Cash, at Fair Value 3,349 8,407    
Available-for-sale Securities 0 0    
Derivative Assets 0 0    
Servicing Assets 0 0    
Assets,Carrying Value [Abstract]        
Restricted Cash And Cash Equivalents 3,349 8,407    
Trading Securities   0    
Fair Value, Inputs, Level 2 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Available-for-sale Securities 974,609 1,216,538    
Held to maturity Fair Value 614,679 164,154    
Federal Home Loan Bank (FHLB) stock 20,783 21,169    
Other Investments 3 3    
Derivative Assets 1,854 2,552    
Receivables, Fair Value Disclosure 6,162 11,221    
Servicing Assets 0 0    
Assets,Carrying Value [Abstract]        
Trading Securities 288 1,594    
Investment securities AFS , carrying value 974,609      
Investment held for sale, carrying amount 620,189 162,752    
Federal Home Loan Bank Stock at carrying value 20,783 21,169    
Other Investment, Carrying Value 3 3    
Derivative Assets, carrying value 1,855 2,552    
Liabilities,Carrying Value Disclosure [Abstract]        
Derivative liabilities at carrying value 6,162 11,221    
Fair Value, Inputs, Level 3 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Available-for-sale Securities 0 0    
Non-covered loans, net 4,101,219 4,909,361    
Derivative Assets 1,171 5,555    
FDIC Indemnification Asset Fair Value Disclosure 17,786 75,969    
Receivables, Fair Value Disclosure 20,637 21,345    
Servicing Assets 7,455 13,992    
Liabilities, Fair Value Disclosure [Abstract]        
Deposits, Fair Value Disclosure 4,705,878 4,887,770    
Securities sold under agreements to repurchase 955,859 1,020,621    
Advances from FHLB 335,812 339,172    
Notes Payable Fair Value Disclosure 2,593 3,979    
Subordinated capital notes 94,940 104,288    
Accrued expenses and other liabilities 92,935 133,290    
Assets,Carrying Value [Abstract]        
Trading Securities 0 0    
Loans, net of allowance for loan and lease losses 4,434,213 4,826,646    
Derivative Assets, carrying value 1,170 5,555    
FDIC Indemnification Asset 22,599 97,378    
Accrued interest receivable 20,637 21,345    
Servicing assets, carrying value 7,455 13,992    
Liabilities,Carrying Value Disclosure [Abstract]        
Deposits, Total 4,715,764 4,918,929    
Securities Sold under Agreements to Repurchase 934,691 980,087    
Advances from FHLB 332,476 334,331    
Term Notes 1,734 4,004    
Subordinated capital notes 102,633 101,584    
Accrued expenses and other liabilities 92,935 133,290    
Derivative liabilities at carrying value $ 1,095 $ 5,477