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Schedule of Estimated Fair Values of Financial Instruments by Level of Valuation Inputs (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Financial assets:    
Investment securities held-to-maturity $ 493,925 $ 513,273
Carrying Amount    
Financial assets:    
Cash and cash equivalents 807,952 782,023
Investment securities available-for-sale 1,657,591 1,611,698
Investment securities held-to-maturity 490,968 512,770
Accrued interest receivable 27,712 29,852
Mortgage servicing rights 19,454 18,457
Mortgages Held-for-sale, Fair Value Disclosure 23,237 61,794
Loans Receivable, Fair Value Disclosure 5,300,311 5,340,536
Derivative Asset 3,023 2,749
Deferred compensation asset at fair value amount 11,108 10,627
Total financial assets 8,341,356 8,370,506
Financial liabilities:    
Total deposits, excluding time deposits 6,299,343 6,324,512
Time deposits 1,000,836 1,051,598
Securities sold under repurchase agreements 587,570 537,556
Other borrowed funds 1 6
Accrued interest payable 4,831 5,421
Long-term debt 27,994 27,970
Subordinated debentures held by subsidiary trusts 82,477 82,477
Derivative Liability 1,688 1,314
Deferred compensation plan liabilities at fair value amount 11,108 10,627
Total financial liabilities 8,015,848 8,041,481
Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 807,952 782,023
Investment securities available-for-sale 1,657,591 1,611,698
Investment securities held-to-maturity 493,925 513,273
Accrued interest receivable 27,712 29,852
Mortgage servicing rights 36,151 35,656
Mortgages Held-for-sale, Fair Value Disclosure 23,237 61,794
Loans Receivable, Fair Value Disclosure 5,148,977 5,248,127
Derivative Asset 3,023 2,749
Deferred compensation asset at fair value amount 11,108 10,627
Total financial assets 8,209,676 8,295,799
Financial liabilities:    
Total deposits, excluding time deposits 6,299,343 6,324,512
Time deposits 992,746 1,044,670
Securities sold under repurchase agreements 587,570 537,556
Other borrowed funds 1 6
Accrued interest payable 4,831 5,421
Long-term debt 27,520 27,477
Subordinated debentures held by subsidiary trusts 85,442 73,554
Derivative Liability 1,688 1,314
Deferred compensation plan liabilities at fair value amount 11,108 10,627
Total financial liabilities 8,010,249 8,025,137
Quoted Prices in Active Markets for Identical Assets (Level 1) | Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 807,952 782,023
Investment securities available-for-sale 0 0
Investment securities held-to-maturity 0 0
Accrued interest receivable 0 0
Mortgage servicing rights 0 0
Mortgages Held-for-sale, Fair Value Disclosure 0 0
Loans Receivable, Fair Value Disclosure 0 0
Derivative Asset 0 0
Deferred compensation asset at fair value amount 0 0
Total financial assets 807,952 782,023
Financial liabilities:    
Total deposits, excluding time deposits 6,299,343 6,324,512
Time deposits 0 0
Securities sold under repurchase agreements 0 0
Other borrowed funds 0 0
Accrued interest payable 0 0
Long-term debt 0 0
Subordinated debentures held by subsidiary trusts 0 0
Derivative Liability 0 0
Deferred compensation plan liabilities at fair value amount 0 0
Total financial liabilities 6,299,343 6,324,512
Significant Other Observable Inputs (Level 2) | Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 0 0
Investment securities available-for-sale 1,657,591 1,611,698
Investment securities held-to-maturity 493,925 513,273
Accrued interest receivable 27,712 29,852
Mortgage servicing rights 36,151 35,656
Mortgages Held-for-sale, Fair Value Disclosure 23,237 61,794
Loans Receivable, Fair Value Disclosure 5,111,493 5,208,783
Derivative Asset 3,023 2,749
Deferred compensation asset at fair value amount 11,108 10,627
Total financial assets 7,364,240 7,474,432
Financial liabilities:    
Total deposits, excluding time deposits 0 0
Time deposits 992,746 1,044,670
Securities sold under repurchase agreements 587,570 537,556
Other borrowed funds 1 6
Accrued interest payable 4,831 5,421
Long-term debt 27,520 27,477
Subordinated debentures held by subsidiary trusts 85,442 73,554
Derivative Liability 1,688 1,314
Deferred compensation plan liabilities at fair value amount 11,108 10,627
Total financial liabilities 1,710,906 1,700,625
Significant Unobservable Inputs (Level 3) | Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 0 0
Investment securities available-for-sale 0 0
Investment securities held-to-maturity 0 0
Accrued interest receivable 0 0
Mortgage servicing rights 0 0
Mortgages Held-for-sale, Fair Value Disclosure 0
Loans Receivable, Fair Value Disclosure 37,484 39,344
Derivative Asset 0 0
Deferred compensation asset at fair value amount 0 0
Total financial assets 37,484 39,344
Financial liabilities:    
Total deposits, excluding time deposits 0 0
Time deposits 0 0
Securities sold under repurchase agreements 0 0
Other borrowed funds 0 0
Accrued interest payable 0 0
Long-term debt 0 0
Subordinated debentures held by subsidiary trusts 0 0
Derivative Liability 0 0
Deferred compensation plan liabilities at fair value amount 0 0
Total financial liabilities $ 0 $ 0