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Fair Value (Quantitative Information about Level 3 fair value measurements) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Securities available for sale $ 1,690,516 $ 1,578,434
Premises, furniture and equipment held for sale 3,889 3,889
Corporate debt securities    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Securities available for sale 830 846
Recurring Basis | Interest rate lock commitments    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Derivative assets 6,956 3,168
Recurring Basis | Corporate debt securities    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Securities available for sale 830 846
Nonrecurring Basis    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Other real estate owned 11,338 11,524
Collateral dependent impaired loans 9,131 6,354
Nonrecurring Basis | Commercial    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Collateral dependent impaired loans 1,344 597
Nonrecurring Basis | Commercial real estate    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Collateral dependent impaired loans 2,609 1,522
Nonrecurring Basis | Agricultural and agricultural real estate    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Collateral dependent impaired loans 0 0
Nonrecurring Basis | Residential real estate    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Collateral dependent impaired loans 3,168 2,330
Nonrecurring Basis | Consumer    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Collateral dependent impaired loans 2,010 1,905
Nonrecurring Basis | Premises, furniture and equipment held for sale    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Premises, furniture and equipment held for sale 3,889 3,889
Level 3    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Securities available for sale 2,104 2,885
Derivative assets 0 0
Level 3 | Interest rate lock commitments    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Derivative assets 6,956 3,168
Level 3 | Recurring Basis | Premises, furniture and equipment held for sale    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Premises, furniture and equipment held for sale 3,889 3,889
Level 3 | Recurring Basis | Interest rate lock commitments    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Derivative assets $ 6,956 $ 3,168
Closing ratio 88.00% 86.00%
Level 3 | Recurring Basis | Z-TRANCHE Securities    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Securities available for sale $ 1,774 $ 2,039
Level 3 | Recurring Basis | Z-TRANCHE Securities | Minimum    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Pretax discount rate 7.50% 7.50%
Actual defaults (as a percent) 22.07% 22.20%
Actual deferrals (as a percent) 10.67% 10.75%
Level 3 | Recurring Basis | Z-TRANCHE Securities | Maximum    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Pretax discount rate 9.50% 9.50%
Actual defaults (as a percent) 34.19% 33.55%
Actual deferrals (as a percent) 20.53% 21.82%
Level 3 | Recurring Basis | Z-TRANCHE Securities | Weighted Average    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Actual defaults (as a percent) 31.03% 30.60%
Actual deferrals (as a percent) 13.21% 13.36%
Level 3 | Recurring Basis | Corporate debt securities    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Securities available for sale $ 330 $ 846
Level 3 | Nonrecurring Basis    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Other real estate owned 11,338 11,524
Collateral dependent impaired loans 9,131 6,354
Level 3 | Nonrecurring Basis | Commercial    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Collateral dependent impaired loans 1,344 597
Level 3 | Nonrecurring Basis | Commercial real estate    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Collateral dependent impaired loans 2,609 1,522
Level 3 | Nonrecurring Basis | Agricultural and agricultural real estate    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Collateral dependent impaired loans 0 0
Level 3 | Nonrecurring Basis | Residential real estate    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Collateral dependent impaired loans 3,168 2,330
Level 3 | Nonrecurring Basis | Consumer    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Collateral dependent impaired loans 2,010 1,905
Level 3 | Nonrecurring Basis | Premises, furniture and equipment held for sale    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Premises, furniture and equipment held for sale $ 3,889 $ 3,889