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Fair Value Measurements and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Securities Available for Sale [Abstract]      
Total Securities Available for Sale $ 1,058,397 $ 1,013,171  
Trading Securities 7,900 7,793  
Liabilities [Abstract]      
Allowance for loan and lease losses collateral dependent impaired loans with specific reserves $ 3,500   $ 3,600
Liquidation expense ratio on impaired collateral minimum 10.00%    
Liquidation expense ratio on impaired collateral maximum 35.00%    
Financial assets [Abstract]      
Securities held to maturity $ 475,436 454,994  
Financial liabilities [Abstract]      
Time deposits 931,966 1,043,823  
Long-term debt 130,635 130,945  
Junior subordinated debt 101,196 101,196  
Carrying Amount [Member] | Significant Other Observable Inputs (Level 2) [Member]      
Financial assets [Abstract]      
Securities held to maturity 470,758 454,361  
Financial liabilities [Abstract]      
Time deposits 931,966 1,043,823  
Long-term debt 130,635 130,945  
Junior subordinated debt 101,196 101,196  
Carrying Amount [Member] | Significant Unobservable Inputs (Level 3) [Member]      
Financial assets [Abstract]      
Net Loans 5,806,129 5,528,912  
Estimated Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]      
Financial assets [Abstract]      
Securities held to maturity 475,436 454,994  
Financial liabilities [Abstract]      
Time deposits 929,477 1,038,877  
Long-term debt 132,849 132,562  
Junior subordinated debt 91,396 103,770  
Estimated Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]      
Financial assets [Abstract]      
Net Loans 5,957,554 5,584,777  
Recurring Basis [Member]      
Securities Available for Sale [Abstract]      
U.S. Treasury   23,111  
Federal Agency 343,263 329,914  
State & municipal 33,647 37,570  
Mortgage-backed 335,810 364,727  
Collateralized mortgage obligations 330,346 242,129  
Other securities 15,331 15,720  
Total Securities Available for Sale 1,058,397 1,013,171  
Trading Securities 7,900 7,793  
Interest Rate Swaps 8,707 4,707  
Total 1,075,004 1,025,671  
Liabilities [Abstract]      
Interest Rate Swaps 8,707 4,707  
Total 8,707 4,707  
Recurring Basis [Member] | Quoted Prices in Active Market for Identical Assets (Level I) [Member]      
Securities Available for Sale [Abstract]      
U.S. Treasury   23,111  
Federal Agency 0 0  
State & municipal 0 0  
Mortgage-backed 0 0  
Collateralized mortgage obligations 0 0  
Other securities 7,422 7,612  
Total Securities Available for Sale 7,422 30,723  
Trading Securities 7,900 7,793  
Interest Rate Swaps 0 0  
Total 15,322 38,516  
Liabilities [Abstract]      
Interest Rate Swaps 0 0  
Total 0 0  
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]      
Securities Available for Sale [Abstract]      
U.S. Treasury   0  
Federal Agency 343,263 329,914  
State & municipal 33,647 37,570  
Mortgage-backed 335,810 364,727  
Collateralized mortgage obligations 330,346 242,129  
Other securities 7,909 8,108  
Total Securities Available for Sale 1,050,975 982,448  
Trading Securities 0 0  
Interest Rate Swaps 8,707 4,707  
Total 1,059,682 987,155  
Liabilities [Abstract]      
Interest Rate Swaps 8,707 4,707  
Total 8,707 4,707  
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]      
Securities Available for Sale [Abstract]      
U.S. Treasury   0  
Federal Agency 0 0  
State & municipal 0 0  
Mortgage-backed 0 0  
Collateralized mortgage obligations 0 0  
Other securities 0 0  
Total Securities Available for Sale 0 0  
Trading Securities 0 0  
Interest Rate Swaps 0 0  
Total 0 0  
Liabilities [Abstract]      
Interest Rate Swaps 0 0  
Total 0 $ 0  
Nonrecurring Basis [Member]      
Liabilities [Abstract]      
Collateral dependent impaired financing receivable with specific reserves $ 9,900   $ 8,800