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Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring and Non-Recurring Basis (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Real Estate Acquired Through Foreclosure, Valuation Adjustments $ 47 $ 17  
Related Allowance 15,465   $ 13,954
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Mortgages Held-for-sale, Fair Value Disclosure 0   0
Deferred compensation asset at fair value amount 0   0
Deferred compensation plan liabilities at fair value amount 0   0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Non-recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans 0   0
Other real estate owned 0   0
Long-lived assets to be disposed of by sale 0   0
Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Mortgages Held-for-sale, Fair Value Disclosure 23,237   61,794
Deferred compensation asset at fair value amount 11,108   10,627
Deferred compensation plan liabilities at fair value amount 11,108   10,627
Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Non-recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans 0   0
Other real estate owned 0   0
Long-lived assets to be disposed of by sale 0   0
Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Mortgages Held-for-sale, Fair Value Disclosure 0   0
Deferred compensation asset at fair value amount 0   0
Deferred compensation plan liabilities at fair value amount 0   0
Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans     39,344
Other real estate owned 1,682   2,110
Real Estate Acquired Through Foreclosure, Valuation Adjustments 47 17  
Impairment of real estate, received updated appraisal 16 11  
Impairment of Real Estate, Change in Management Estimates 31 $ 6  
Long-lived assets to be disposed of by sale 356   1,335
Related Allowance 14,901   13,954
Impaired Financing Receivable, Related Allowance, Partial Loan Charge-Offs 10,919   11,941
US Treasury Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 0   0
US Treasury Securities [Member] | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 3,612   3,612
US Treasury Securities [Member] | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 0   0
Obligations of U.S. government agencies | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 0   0
Obligations of U.S. government agencies | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 407,243   391,297
Obligations of U.S. government agencies | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 0   0
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 0   0
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 1,243,663   1,213,701
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 0   0
Private mortgage-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 0   0
Private mortgage-backed securities | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 106   116
Private mortgage-backed securities | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 0   0
Other Investments | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 0   0
Other Investments | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 2,967   2,972
Other Investments | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 0   0
Estimated Fair Value      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 1,657,591   1,611,698
Loans Receivable, Fair Value Disclosure 5,148,977   5,248,127
Derivative Asset 3,023   2,749
Derivative Liability 1,688   1,314
Mortgages Held-for-sale, Fair Value Disclosure 23,237   61,794
Deferred compensation asset at fair value amount 11,108   10,627
Deferred compensation plan liabilities at fair value amount 11,108   10,627
Estimated Fair Value | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Mortgages Held-for-sale, Fair Value Disclosure 23,237   61,794
Deferred compensation asset at fair value amount 11,108   10,627
Deferred compensation plan liabilities at fair value amount 11,108   10,627
Estimated Fair Value | Fair Value Measured on a Non-recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans 37,484   39,344
Other real estate owned 1,682   2,110
Long-lived assets to be disposed of by sale 356   1,335
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 0   0
Loans Receivable, Fair Value Disclosure 0   0
Derivative Asset 0   0
Derivative Liability 0   0
Mortgages Held-for-sale, Fair Value Disclosure 0   0
Deferred compensation asset at fair value amount 0   0
Deferred compensation plan liabilities at fair value amount 0   0
Estimated Fair Value | Significant Other Observable Inputs (Level 2)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 1,657,591   1,611,698
Loans Receivable, Fair Value Disclosure 5,111,493   5,208,783
Derivative Asset 3,023   2,749
Derivative Liability 1,688   1,314
Mortgages Held-for-sale, Fair Value Disclosure 23,237   61,794
Deferred compensation asset at fair value amount 11,108   10,627
Deferred compensation plan liabilities at fair value amount 11,108   10,627
Estimated Fair Value | Significant Unobservable Inputs (Level 3)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 0   0
Loans Receivable, Fair Value Disclosure 37,484   39,344
Derivative Asset 0   0
Derivative Liability 0   0
Mortgages Held-for-sale, Fair Value Disclosure 0  
Deferred compensation asset at fair value amount 0   0
Deferred compensation plan liabilities at fair value amount 0   0
Estimated Fair Value | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans 37,484   39,344
Estimated Fair Value | US Treasury Securities [Member] | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 3,612   3,612
Estimated Fair Value | Obligations of U.S. government agencies | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 407,243   391,297
Estimated Fair Value | U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 1,243,663   1,213,701
Estimated Fair Value | Private mortgage-backed securities | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 106   116
Estimated Fair Value | Other Investments | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 2,967   2,972
Carrying Amount      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available-for-sale 1,657,591   1,611,698
Loans Receivable, Fair Value Disclosure 5,300,311   5,340,536
Derivative Asset 3,023   2,749
Derivative Liability 1,688   1,314
Mortgages Held-for-sale, Fair Value Disclosure 23,237   61,794
Deferred compensation asset at fair value amount 11,108   10,627
Deferred compensation plan liabilities at fair value amount 11,108   10,627
Carrying Amount | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans 63,304   65,238
Long-lived assets to be disposed of by sale 565   2,363
Change During Period | Fair Value Measured on a Non-recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-lived assets to be disposed of by sale 209   1,028
Interest Rate Swap | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 0   0
Derivative Liability 0   0
Interest Rate Swap | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 1,311   1,332
Derivative Liability 1,283   1,314
Interest Rate Swap | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 0   0
Derivative Liability 0   0
Interest Rate Swap | Estimated Fair Value | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 1,311   1,332
Derivative Liability 1,283   1,314
Interest Rate Lock Commitments [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 0   0
Interest Rate Lock Commitments [Member] | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 1,712   1,131
Interest Rate Lock Commitments [Member] | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 0   0
Interest Rate Lock Commitments [Member] | Estimated Fair Value | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 1,712   1,131
Forward Contracts [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset     0
Derivative Liability 0    
Forward Contracts [Member] | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset     286
Derivative Liability 405    
Forward Contracts [Member] | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset     0
Derivative Liability 0    
Forward Contracts [Member] | Estimated Fair Value | Fair Value Measured on a Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset     $ 286
Derivative Liability $ 405