v3.3.1.900
Fair Value Measurements - Schedule of Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value $ 451,770 $ 400,146
Held-to-maturity Securities, Fair Value 43,441 45,795
Purchases, sales, issuances and settlements:    
State Tax Credits Held For Sale, Fair Value Disclosure 5,941 11,689
Level 3 | Recurring basis    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 3,077 3,059
Purchases, sales, issuances and settlements:    
State Tax Credits Held For Sale, Fair Value Disclosure 5,941 11,689
Derivative financial instruments 0 0
Assets, Fair Value Disclosure 9,018 14,748
Derivative financial instruments 0 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0 0
Level 3 | Securities available for sale, at fair value | Recurring basis    
Level 3 Financial Instruments Measured at Fair Value    
Beginning balance 3,059 3,040
Total gains:    
Included in other comprehensive income 18 19
Purchases, sales, issuances and settlements:    
Purchases 0 0
Transfer in and/or out of Level 3 0 0
Ending balance 3,077 3,059
Change in unrealized gains (losses) relating to assets still held at the reporting date 18 19
Level 3 | State tax credits held for sale, at fair value | Recurring basis    
Level 3 Financial Instruments Measured at Fair Value    
Beginning balance 11,689 16,491
Total gains:    
Total gains: 406 558
Purchases, sales, issuances and settlements:    
Sales (6,154) (5,360)
Ending balance 5,941 11,689
Change in unrealized gains (losses) relating to assets still held at the reporting date 1,212 (868)
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 0 0
Purchases, sales, issuances and settlements:    
State Tax Credits Held For Sale, Fair Value Disclosure 0 0
Derivative financial instruments 0 0
Assets, Fair Value Disclosure 0 0
Derivative financial instruments 0 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0 0
Significant Other Observable Inputs (Level 2) | Recurring basis    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 448,693 397,087
Purchases, sales, issuances and settlements:    
State Tax Credits Held For Sale, Fair Value Disclosure 0 0
Derivative financial instruments 1,155 909
Assets, Fair Value Disclosure 449,848 397,996
Derivative financial instruments 1,155 907
Financial and Nonfinancial Liabilities, Fair Value Disclosure 1,155 907
Total Fair Value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 451,770 400,146
Purchases, sales, issuances and settlements:    
State Tax Credits Held For Sale, Fair Value Disclosure 49,588 42,970
Derivative financial instruments 1,155 909
Derivative financial instruments 1,155 907
Total Fair Value | Recurring basis    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 451,770 400,146
Purchases, sales, issuances and settlements:    
State Tax Credits Held For Sale, Fair Value Disclosure 5,941 11,689
Derivative financial instruments 1,155 909
Assets, Fair Value Disclosure 458,866 412,744
Derivative financial instruments 1,155 907
Financial and Nonfinancial Liabilities, Fair Value Disclosure 1,155 907
Obligations of U.S. Government-sponsored enterprises    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 99,008 91,826
Obligations of U.S. Government-sponsored enterprises | Level 3 | Recurring basis    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 0 0
Obligations of U.S. Government-sponsored enterprises | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 0 0
Obligations of U.S. Government-sponsored enterprises | Significant Other Observable Inputs (Level 2) | Recurring basis    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 99,008 91,826
Obligations of U.S. Government-sponsored enterprises | Total Fair Value | Recurring basis    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 99,008 91,826
Obligations of states and political subdivisions    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 41,701 34,881
Obligations of states and political subdivisions | Level 3 | Recurring basis    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 3,077 3,059
Obligations of states and political subdivisions | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 0 0
Obligations of states and political subdivisions | Significant Other Observable Inputs (Level 2) | Recurring basis    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 38,624 31,822
Obligations of states and political subdivisions | Total Fair Value | Recurring basis    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 41,701 34,881
Residential mortgage-backed securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 311,061 273,439
Residential mortgage-backed securities | Level 3 | Recurring basis    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 0 0
Residential mortgage-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 0 0
Residential mortgage-backed securities | Significant Other Observable Inputs (Level 2) | Recurring basis    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 311,061 273,439
Residential mortgage-backed securities | Total Fair Value | Recurring basis    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value $ 311,061 $ 273,439