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Fair value (Estimated fair value and carrying value) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities $ 1,007,705   $ 1,216,538      
Held to maturity Fair Value 595,148   164,154      
Federal Home Loan Bank (FHLB) stock 20,804   21,169      
Other Investments 3   3      
Derivative Assets 3,290   8,107      
Servicing Assets 6,463 $ 5,791 13,992 $ 13,986 $ 13,970 $ 13,801
Liabilities, Fair Value Disclosure [Abstract]            
Derivative liabilities 8,622   11,221      
Assets,Carrying Value [Abstract]            
Total cash and cash equivalents 526,196   573,427 671,239   621,269
Restricted Cash And Cash Equivalents 4,349   8,407      
Trading Securities 583   1,594      
Loans, net of allowance for loan and lease losses 4,444,902   4,807,825      
FDIC Indemnification Asset 22,895 $ 22,704 97,378 $ 120,619 $ 143,660 $ 189,240
Accrued interest receivable 18,625   21,345      
Liabilities,Carrying Value Disclosure [Abstract]            
Deposits, Total 4,717,074   4,924,406      
Securities Sold under Agreements to Repurchase 1,000,664   980,087      
Subordinated capital notes 102,371   101,584      
Securities Purchased But Not Yet Received 0   0      
Accrued expenses and other liabilities 113,450   133,290      
Fair Value, Inputs, Level 1 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Cash and Cash Equivalents, Fair Value Disclosure 526,196   573,427      
Restricted Cash, at Fair Value 4,349   8,407      
Assets,Carrying Value [Abstract]            
Total cash and cash equivalents 526,196   573,427      
Restricted Cash And Cash Equivalents 4,349   8,407      
Fair Value, Inputs, Level 2 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities 1,007,705   1,216,538      
Held to maturity Fair Value 595,148   164,154      
Federal Home Loan Bank (FHLB) stock 20,804   21,169      
Other Investments 3   3      
Derivative Assets 2,175   2,552      
Receivables, Fair Value Disclosure 8,622   11,221      
Assets,Carrying Value [Abstract]            
Trading Securities 583   1,594      
Investment held for sale, carrying amount 594,639   162,752      
Federal Home Loan Bank Stock at carrying value 20,804   21,169      
Other Investment, Carrying Value 3   3      
Derivative Assets, carrying value 2,175   2,552      
Liabilities,Carrying Value Disclosure [Abstract]            
Derivative liabilities at carrying value 8,622   11,221      
Fair Value, Inputs, Level 3 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Non-covered loans, net 4,408,998   4,909,361      
Derivative Assets 1,115   5,555      
FDIC Indemnification Asset Fair Value Disclosure 14,151   75,969      
Receivables, Fair Value Disclosure 18,625   21,345      
Servicing Assets 6,463   13,992      
Liabilities, Fair Value Disclosure [Abstract]            
Deposits, Fair Value Disclosure 4,714,106   4,893,247      
Securities sold under agreements to repurchase 1,029,439   1,020,621      
Advances from FHLB 336,859   339,172      
Notes Payable Fair Value Disclosure 1,842   3,979      
Subordinated capital notes 94,127   104,288      
Derivative liabilities 1,041   5,477      
Accrued expenses and other liabilities 113,450   133,290      
Assets,Carrying Value [Abstract]            
Loans, net of allowance for loan and lease losses 4,468,676   4,826,646      
Derivative Assets, carrying value 1,115   5,555      
FDIC Indemnification Asset 22,895   97,378      
Accrued interest receivable 18,625   21,345      
Servicing assets, carrying value 6,463   13,992      
Liabilities,Carrying Value Disclosure [Abstract]            
Deposits, Total 4,717,074   4,924,406      
Securities Sold under Agreements to Repurchase 1,000,664   980,087      
Advances from FHLB 332,936   334,331      
Term Notes 1,734   4,004      
Subordinated capital notes 102,371   101,584      
Accrued expenses and other liabilities 113,450   133,290      
Derivative liabilities at carrying value $ 1,041   $ 5,477