Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financial assets:
Fair Value	$ 671,488	$ 674,248
Trust preferred securities
Financial assets:
Fair Value	9,388	18,389
Other debt securities
Financial assets:
Fair Value	17,290	22,145
Obligations of other U.S. Government agencies and corporations
Financial assets:
Fair Value	3,564	2,158
Obligations of states and political subdivisions
Financial assets:
Fair Value	234,481
Government agency mortgage backed securities | Residential mortgage backed securities:
Financial assets:
Fair Value	193,950	409,317
Government agency mortgage backed securities | Commercial mortgage backed securities:
Financial assets:
Fair Value	31,170	50,863
Government agency collateralized mortgage obligations | Residential mortgage backed securities:
Financial assets:
Fair Value	176,639	168,826
Government agency collateralized mortgage obligations | Commercial mortgage backed securities:
Financial assets:
Fair Value	5,006	2,550
Quoted Prices In Active Markets for Identical Assets (Level 1)
Financial assets:
Fair Value	0	0
Derivative instruments	0	0
Financial liabilities:
Derivative instruments	0	0
Significant Other Observable Inputs (Level 2)
Financial assets:
Fair Value	662,100	655,859
Derivative instruments	5,977	9,108
Financial liabilities:
Derivative instruments	6,039	5,910
Significant Other Observable Inputs (Level 2) | Interest rate swap
Financial liabilities:
Derivative instruments	2,536
Significant Other Observable Inputs (Level 2) | Interest rate contracts
Financial assets:
Derivative instruments	3,171
Financial liabilities:
Derivative instruments	3,171
Significant Other Observable Inputs (Level 2) | Interest rate lock commitments
Financial assets:
Derivative instruments	2,756
Significant Other Observable Inputs (Level 2) | Forward commitments
Financial assets:
Derivative instruments	50	4,480
Financial liabilities:
Derivative instruments	328
Significant Unobservable Inputs (Level 3)
Financial assets:
Fair Value	9,388	18,389
Derivative instruments	0	0
Financial liabilities:
Derivative instruments	0	0
Recurring
Financial assets:
Fair Value	671,488	674,248
Derivative instruments	5,977	9,108
Total financial assets	785,781	861,222
Financial liabilities:
Derivative instruments	6,039	5,910
Total financial liabilities	6,039	5,910
Recurring | Interest rate swap
Financial liabilities:
Derivative instruments	2,536	3,410
Recurring | Interest rate contracts
Financial assets:
Derivative instruments	3,171	1,985
Financial liabilities:
Derivative instruments	3,171	1,985
Recurring | Interest rate lock commitments
Financial assets:
Derivative instruments	2,756	2,643
Financial liabilities:
Derivative instruments	4	246
Recurring | Forward commitments
Financial assets:
Derivative instruments	50	4,480
Financial liabilities:
Derivative instruments	328	269
Recurring | Mortgage loans held for sale
Financial assets:
Derivative instruments	108,316	177,866
Recurring | Trust preferred securities
Financial assets:
Fair Value	9,388	18,389
Recurring | Other debt securities
Financial assets:
Fair Value	17,290	22,145
Recurring | Obligations of other U.S. Government agencies and corporations
Financial assets:
Fair Value	3,564	2,158
Recurring | Obligations of states and political subdivisions
Financial assets:
Fair Value	234,481
Recurring | Government agency mortgage backed securities | Residential mortgage backed securities:
Financial assets:
Fair Value	193,950	409,317
Recurring | Government agency mortgage backed securities | Commercial mortgage backed securities:
Financial assets:
Fair Value	31,170	50,863
Recurring | Government agency collateralized mortgage obligations | Residential mortgage backed securities:
Financial assets:
Fair Value	176,639	168,826
Recurring | Government agency collateralized mortgage obligations | Commercial mortgage backed securities:
Financial assets:
Fair Value	5,006	2,550
Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1)
Financial assets:
Fair Value	0	0
Derivative instruments	0	0
Total financial assets	0	0
Financial liabilities:
Derivative instruments	0	0
Total financial liabilities	0	0
Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Interest rate swap
Financial liabilities:
Derivative instruments	0	0
Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Interest rate contracts
Financial assets:
Derivative instruments	0	0
Financial liabilities:
Derivative instruments	0	0
Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Interest rate lock commitments
Financial assets:
Derivative instruments	0	0
Financial liabilities:
Derivative instruments	0	0
Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Forward commitments
Financial assets:
Derivative instruments	0	0
Financial liabilities:
Derivative instruments	0	0
Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Mortgage loans held for sale
Financial assets:
Derivative instruments	0	0
Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Trust preferred securities
Financial assets:
Fair Value	0	0
Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Other debt securities
Financial assets:
Fair Value	0	0
Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Obligations of other U.S. Government agencies and corporations
Financial assets:
Fair Value	0	0
Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Obligations of states and political subdivisions
Financial assets:
Fair Value	0
Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Government agency mortgage backed securities | Residential mortgage backed securities:
Financial assets:
Fair Value	0	0
Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Government agency mortgage backed securities | Commercial mortgage backed securities:
Financial assets:
Fair Value	0	0
Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Government agency collateralized mortgage obligations | Residential mortgage backed securities:
Financial assets:
Fair Value	0	0
Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Government agency collateralized mortgage obligations | Commercial mortgage backed securities:
Financial assets:
Fair Value	0	0
Recurring | Significant Other Observable Inputs (Level 2)
Financial assets:
Fair Value	662,100	655,859
Derivative instruments	5,977	9,108
Total financial assets	776,393	842,833
Financial liabilities:
Derivative instruments	6,039	5,910
Total financial liabilities	6,039	5,910
Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swap
Financial liabilities:
Derivative instruments		3,410
Recurring | Significant Other Observable Inputs (Level 2) | Interest rate contracts
Financial assets:
Derivative instruments		1,985
Financial liabilities:
Derivative instruments		1,985
Recurring | Significant Other Observable Inputs (Level 2) | Interest rate lock commitments
Financial assets:
Derivative instruments		2,643
Financial liabilities:
Derivative instruments	4	246
Recurring | Significant Other Observable Inputs (Level 2) | Forward commitments
Financial liabilities:
Derivative instruments		269
Recurring | Significant Other Observable Inputs (Level 2) | Mortgage loans held for sale
Financial assets:
Derivative instruments	108,316	177,866
Recurring | Significant Other Observable Inputs (Level 2) | Trust preferred securities
Financial assets:
Fair Value	0	0
Recurring | Significant Other Observable Inputs (Level 2) | Other debt securities
Financial assets:
Fair Value	17,290	22,145
Recurring | Significant Other Observable Inputs (Level 2) | Obligations of other U.S. Government agencies and corporations
Financial assets:
Fair Value	3,564	2,158
Recurring | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions
Financial assets:
Fair Value	234,481
Recurring | Significant Other Observable Inputs (Level 2) | Government agency mortgage backed securities | Residential mortgage backed securities:
Financial assets:
Fair Value	193,950	409,317
Recurring | Significant Other Observable Inputs (Level 2) | Government agency mortgage backed securities | Commercial mortgage backed securities:
Financial assets:
Fair Value	31,170	50,863
Recurring | Significant Other Observable Inputs (Level 2) | Government agency collateralized mortgage obligations | Residential mortgage backed securities:
Financial assets:
Fair Value	176,639	168,826
Recurring | Significant Other Observable Inputs (Level 2) | Government agency collateralized mortgage obligations | Commercial mortgage backed securities:
Financial assets:
Fair Value	5,006	2,550
Recurring | Significant Unobservable Inputs (Level 3)
Financial assets:
Fair Value	9,388	18,389
Derivative instruments	0	0
Total financial assets	9,388	18,389
Financial liabilities:
Derivative instruments	0	0
Total financial liabilities	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Interest rate swap
Financial liabilities:
Derivative instruments	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Interest rate contracts
Financial assets:
Derivative instruments	0	0
Financial liabilities:
Derivative instruments	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Interest rate lock commitments
Financial assets:
Derivative instruments	0	0
Financial liabilities:
Derivative instruments	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Forward commitments
Financial assets:
Derivative instruments	0	0
Financial liabilities:
Derivative instruments	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage loans held for sale
Financial assets:
Derivative instruments	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Trust preferred securities
Financial assets:
Fair Value	9,388	18,389
Recurring | Significant Unobservable Inputs (Level 3) | Other debt securities
Financial assets:
Fair Value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Obligations of other U.S. Government agencies and corporations
Financial assets:
Fair Value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Obligations of states and political subdivisions
Financial assets:
Fair Value	0
Recurring | Significant Unobservable Inputs (Level 3) | Government agency mortgage backed securities | Residential mortgage backed securities:
Financial assets:
Fair Value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Government agency mortgage backed securities | Commercial mortgage backed securities:
Financial assets:
Fair Value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Government agency collateralized mortgage obligations | Residential mortgage backed securities:
Financial assets:
Fair Value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Government agency collateralized mortgage obligations | Commercial mortgage backed securities:
Financial assets:
Fair Value	$ 0	$ 0