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Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Securities Available for Sale [Abstract]    
Total Securities Available for Sale $ 1,174,544 $ 1,013,171
Trading Securities 8,377 7,793
Liabilities [Abstract]    
Collateral dependent impaired financing receivable with specific reserves 5,900  
Allowance for loan and lease losses collateral dependent impaired loans with specific reserves $ 2,000  
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 $ 473,140 454,994
Financial liabilities [Abstract]    
Time deposits 908,827 1,043,823
Long-term debt 130,447 130,945
Junior subordinated debt 101,196 101,196
Carrying Amount [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial assets [Abstract]    
Securities held to maturity 471,031 454,361
Financial liabilities [Abstract]    
Time deposits 908,827 1,043,823
Long-term debt 130,447 130,945
Junior subordinated debt 101,196 101,196
Carrying Amount [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial assets [Abstract]    
Net Loans 5,820,115 5,528,912
Estimated Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial assets [Abstract]    
Securities held to maturity 473,140 454,994
Financial liabilities [Abstract]    
Time deposits 903,501 1,038,877
Long-term debt 131,268 132,562
Junior subordinated debt 97,346 103,770
Estimated Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial assets [Abstract]    
Net Loans 5,958,427 5,584,777
Recurring Basis [Member]    
Securities Available for Sale [Abstract]    
U.S. Treasury   23,111
Federal Agency 311,272 329,914
State & municipal 31,637 37,570
Mortgage-backed 409,896 364,727
Collateralized mortgage obligations 404,971 242,129
Other securities 16,768 15,720
Total Securities Available for Sale 1,174,544 1,013,171
Trading Securities 8,377 7,793
Interest Rate Swaps 6,224 4,707
Total 1,189,145 1,025,671
Liabilities [Abstract]    
Interest Rate Swaps 6,224 4,707
Total 6,224 4,707
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [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 7,526 7,612
Total Securities Available for Sale 7,526 30,723
Trading Securities 8,377 7,793
Interest Rate Swaps 0 0
Total 15,903 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 311,272 329,914
State & municipal 31,637 37,570
Mortgage-backed 409,896 364,727
Collateralized mortgage obligations 404,971 242,129
Other securities 9,242 8,108
Total Securities Available for Sale 1,167,018 982,448
Trading Securities 0 0
Interest Rate Swaps 6,224 4,707
Total 1,173,242 987,155
Liabilities [Abstract]    
Interest Rate Swaps 6,224 4,707
Total 6,224 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