Fair Value Measurements - (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financial assets:
Securities available for sale	$ 545,797	$ 553,584
Trust preferred securities
Financial assets:
Securities available for sale	20,126	19,756
Other debt securities
Financial assets:
Securities available for sale	17,494	17,930
Other equity securities
Financial assets:
Securities available for sale	3,660	3,599
Obligations of other U.S. Government agencies and corporations
Financial assets:
Securities available for sale	6,231	6,147
Government agency mortgage backed securities | Residential mortgage backed securities:
Financial assets:
Securities available for sale	298,082	296,359
Government agency mortgage backed securities | Commercial mortgage backed securities:
Financial assets:
Securities available for sale	43,570	47,185
Government agency collateralized mortgage obligations | Residential mortgage backed securities:
Financial assets:
Securities available for sale	151,808	157,436
Government agency collateralized mortgage obligations | Commercial mortgage backed securities:
Financial assets:
Securities available for sale	4,826	5,172
Recurring
Financial assets:
Securities available for sale	545,797	553,584
Derivative instruments	7,423	3,731
Total financial assets	656,000	582,943
Financial liabilities:
Derivative instruments	8,938	6,293
Total financial liabilities	8,938	6,293
Recurring | Interest rate swaps
Financial assets:
Derivative instruments	0	0
Financial liabilities:
Derivative instruments	4,931	3,847
Recurring | Interest rate contracts
Financial assets:
Derivative instruments	3,086	2,142
Financial liabilities:
Derivative instruments	3,086	2,143
Recurring | Interest rate lock commitments
Financial assets:
Derivative instruments	4,293	1,584
Financial liabilities:
Derivative instruments	4	0
Recurring | Forward commitments
Financial assets:
Derivative instruments	44	5
Financial liabilities:
Derivative instruments	917	303
Recurring | Mortgage loans held for sale
Financial assets:
Derivative instruments	102,780	25,628
Recurring | Trust preferred securities
Financial assets:
Securities available for sale	20,126	19,756
Recurring | Other debt securities
Financial assets:
Securities available for sale	17,494	17,930
Recurring | Other equity securities
Financial assets:
Securities available for sale	3,660	3,599
Recurring | Obligations of other U.S. Government agencies and corporations
Financial assets:
Securities available for sale	6,231	6,147
Recurring | Government agency mortgage backed securities | Residential mortgage backed securities:
Financial assets:
Securities available for sale	298,082	296,359
Recurring | Government agency mortgage backed securities | Commercial mortgage backed securities:
Financial assets:
Securities available for sale	43,570	47,185
Recurring | Government agency collateralized mortgage obligations | Residential mortgage backed securities:
Financial assets:
Securities available for sale	151,808	157,436
Recurring | Government agency collateralized mortgage obligations | Commercial mortgage backed securities:
Financial assets:
Securities available for sale	4,826	5,172
Recurring | Level 1
Financial assets:
Securities available for sale	0	0
Derivative instruments	0	0
Total financial assets	0	0
Financial liabilities:
Derivative instruments	0	0
Total financial liabilities	0	0
Recurring | Level 1 | Interest rate swaps
Financial assets:
Derivative instruments	0	0
Financial liabilities:
Derivative instruments	0	0
Recurring | Level 1 | Interest rate contracts
Financial assets:
Derivative instruments	0	0
Financial liabilities:
Derivative instruments	0	0
Recurring | Level 1 | Interest rate lock commitments
Financial assets:
Derivative instruments	0	0
Financial liabilities:
Derivative instruments	0	0
Recurring | Level 1 | Forward commitments
Financial assets:
Derivative instruments	0	0
Financial liabilities:
Derivative instruments	0	0
Recurring | Level 1 | Mortgage loans held for sale
Financial assets:
Derivative instruments	0	0
Recurring | Level 1 | Trust preferred securities
Financial assets:
Securities available for sale	0	0
Recurring | Level 1 | Other debt securities
Financial assets:
Securities available for sale	0	0
Recurring | Level 1 | Other equity securities
Financial assets:
Securities available for sale	0	0
Recurring | Level 1 | Obligations of other U.S. Government agencies and corporations
Financial assets:
Securities available for sale	0	0
Recurring | Level 1 | Government agency mortgage backed securities | Residential mortgage backed securities:
Financial assets:
Securities available for sale	0	0
Recurring | Level 1 | Government agency mortgage backed securities | Commercial mortgage backed securities:
Financial assets:
Securities available for sale	0	0
Recurring | Level 1 | Government agency collateralized mortgage obligations | Residential mortgage backed securities:
Financial assets:
Securities available for sale	0	0
Recurring | Level 1 | Government agency collateralized mortgage obligations | Commercial mortgage backed securities:
Financial assets:
Securities available for sale	0	0
Recurring | Level 2
Financial assets:
Securities available for sale	525,671	533,828
Derivative instruments	7,423	3,731
Total financial assets	635,874	563,187
Financial liabilities:
Derivative instruments	8,938	6,293
Total financial liabilities	8,938	6,293
Recurring | Level 2 | Interest rate swaps
Financial assets:
Derivative instruments	0	0
Financial liabilities:
Derivative instruments	4,931	3,847
Recurring | Level 2 | Interest rate contracts
Financial assets:
Derivative instruments	3,086	2,142
Financial liabilities:
Derivative instruments	3,086	2,143
Recurring | Level 2 | Interest rate lock commitments
Financial assets:
Derivative instruments	4,293	1,584
Financial liabilities:
Derivative instruments	4	0
Recurring | Level 2 | Forward commitments
Financial assets:
Derivative instruments	44	5
Financial liabilities:
Derivative instruments	917	303
Recurring | Level 2 | Mortgage loans held for sale
Financial assets:
Derivative instruments	102,780	25,628
Recurring | Level 2 | Trust preferred securities
Financial assets:
Securities available for sale	0	0
Recurring | Level 2 | Other debt securities
Financial assets:
Securities available for sale	17,494	17,930
Recurring | Level 2 | Other equity securities
Financial assets:
Securities available for sale	3,660	3,599
Recurring | Level 2 | Obligations of other U.S. Government agencies and corporations
Financial assets:
Securities available for sale	6,231	6,147
Recurring | Level 2 | Government agency mortgage backed securities | Residential mortgage backed securities:
Financial assets:
Securities available for sale	298,082	296,359
Recurring | Level 2 | Government agency mortgage backed securities | Commercial mortgage backed securities:
Financial assets:
Securities available for sale	43,570	47,185
Recurring | Level 2 | Government agency collateralized mortgage obligations | Residential mortgage backed securities:
Financial assets:
Securities available for sale	151,808	157,436
Recurring | Level 2 | Government agency collateralized mortgage obligations | Commercial mortgage backed securities:
Financial assets:
Securities available for sale	4,826	5,172
Recurring | Level 3
Financial assets:
Securities available for sale	20,126	19,756
Derivative instruments	0	0
Total financial assets	20,126	19,756
Financial liabilities:
Derivative instruments	0	0
Total financial liabilities	0	0
Recurring | Level 3 | Interest rate swaps
Financial assets:
Derivative instruments	0	0
Financial liabilities:
Derivative instruments	0	0
Recurring | Level 3 | Interest rate contracts
Financial assets:
Derivative instruments	0	0
Financial liabilities:
Derivative instruments	0	0
Recurring | Level 3 | Interest rate lock commitments
Financial assets:
Derivative instruments	0	0
Financial liabilities:
Derivative instruments	0	0
Recurring | Level 3 | Forward commitments
Financial assets:
Derivative instruments	0	0
Financial liabilities:
Derivative instruments	0	0
Recurring | Level 3 | Mortgage loans held for sale
Financial assets:
Derivative instruments	0	0
Recurring | Level 3 | Trust preferred securities
Financial assets:
Securities available for sale	20,126	19,756
Recurring | Level 3 | Other debt securities
Financial assets:
Securities available for sale	0	0
Recurring | Level 3 | Other equity securities
Financial assets:
Securities available for sale	0	0
Recurring | Level 3 | Obligations of other U.S. Government agencies and corporations
Financial assets:
Securities available for sale	0	0
Recurring | Level 3 | Government agency mortgage backed securities | Residential mortgage backed securities:
Financial assets:
Securities available for sale	0	0
Recurring | Level 3 | Government agency mortgage backed securities | Commercial mortgage backed securities:
Financial assets:
Securities available for sale	0	0
Recurring | Level 3 | Government agency collateralized mortgage obligations | Residential mortgage backed securities:
Financial assets:
Securities available for sale	0	0
Recurring | Level 3 | Government agency collateralized mortgage obligations | Commercial mortgage backed securities:
Financial assets:
Securities available for sale	$ 0	$ 0