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Fair Value of Financial Instruments (Estimated fair value and carrying value) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Assets, Fair Value Disclosure [Abstract]      
Available-for-sale Securities $ 857,433 $ 841,857  
Held to maturity Fair Value 0 410,353  
Federal Home Loan Bank (FHLB) stock 12,821 12,644  
Other Investments 3 3  
Derivative Assets 26 347  
Servicing Assets 10,134 10,716  
Assets,Carrying Value [Abstract]      
Restricted Cash And Cash Equivalents 1,049 3,030 $ 3,030
Trading Securities 412 360  
Accrued interest receivable 33,909 34,254  
Liabilities,Carrying Value Disclosure [Abstract]      
Deposits, Total 4,945,137 4,908,115  
Securities Sold under Agreements to Repurchase 240,324 455,508  
Subordinated capital notes 36,083 36,083  
Accrued expenses and other liabilities 70,512 87,665  
Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Cash and Cash Equivalents, Fair Value Disclosure 676,381 447,033  
Restricted Cash, at Fair Value 1,049 3,030  
Assets,Carrying Value [Abstract]      
Cash and Cash Equivalents, at Carrying Value 676,381 447,033  
Restricted Cash And Cash Equivalents 1,049 3,030  
Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Trading Securities 412 360  
Available-for-sale Securities 857,433 841,857  
Held to maturity Fair Value 0 410,353  
Federal Home Loan Bank (FHLB) stock 12,821 12,644  
Other Investments 3 3  
Derivative Assets 26 347  
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Liabilities Current 985 333  
Assets,Carrying Value [Abstract]      
Trading Securities 412 360  
Investment securities AFS , carrying value 857,433 841,857  
Investment held for sale, carrying amount 0 424,740  
Federal Home Loan Bank Stock at carrying value 12,821 12,644  
Other Investment, Carrying Value 3 3  
Derivative Assets, carrying value 26 347  
Liabilities,Carrying Value Disclosure [Abstract]      
Derivative liabilities, carrying value 985 333  
Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Loans Including HFS Fair Value 4,186,613 4,106,628  
Receivables, Fair Value Disclosure 33,909 34,254  
Servicing Assets 10,134 10,716  
Account Receivable and Other assets, Fair Value 37,443 37,842  
Liabilities, Fair Value Disclosure [Abstract]      
Deposits, Fair Value Disclosure 4,941,446 4,881,903  
Securities sold under agreements to repurchase 239,038 453,135  
Advances from FHLB 81,868 78,503  
Other Borrowings 338 1,214  
Subordinated capital notes 37,076 36,184  
Accrued expenses and other liabilities 70,512 87,665  
Assets,Carrying Value [Abstract]      
Loans, net of allowance for loan and lease losses 4,474,497 4,431,594  
Accrued interest receivable 33,909 34,254  
Servicing assets, carrying value 10,134 10,716  
Account receivable and oher assets, carrying value 37,443 37,842  
Liabilities,Carrying Value Disclosure [Abstract]      
Deposits, Total 4,945,137 4,908,115  
Securities Sold under Agreements to Repurchase 240,324 455,508  
Advances from FHLB 80,085 77,620  
Other Borrowings 338 1,214  
Subordinated capital notes 36,083 36,083  
Accrued expenses and other liabilities $ 70,512 $ 87,665