Fair Value (Recorded amount of assets and liabilities measured at fair value) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
AFS Securities
AFS securities	$ 602,463	$ 660,136
Fair value, total	610,247	669,858
Level 1 [Member]
AFS Securities
Fair value, total	$ 3,406	$ 3,299
Percent of assets and liabilities measured at fair value	0.56%	0.49%
Level 2 [Member]
AFS Securities
Fair value, total	$ 598,905	$ 656,837
Percent of assets and liabilities measured at fair value	98.14%	98.06%
Level 3 [Member]
AFS Securities
Fair value, total	$ 7,936	$ 9,722
Percent of assets and liabilities measured at fair value	1.30%	1.45%
Recurring items [Member]
AFS Securities
AFS securities	$ 602,463	$ 660,136
Derivative Liability	(152)	0
Recurring items [Member] | Government sponsored enterprises [Member]
AFS Securities
AFS securities	10,371	24,345
Recurring items [Member] | States and political subdivisions [Member]
AFS Securities
AFS securities	226,047	232,217
Recurring items [Member] | Auction rate money market preferred [Member]
AFS Securities
AFS securities	3,119	2,866
Recurring items [Member] | Preferred stock [Member]
AFS Securities
AFS securities	3,406	3,299
Recurring items [Member] | Mortgage-backed securities [Member]
AFS Securities
AFS securities	240,195	263,384
Recurring items [Member] | Collateralized mortgage obligations [Member]
AFS Securities
AFS securities	119,325	134,025
Recurring items [Member] | Level 1 [Member]
AFS Securities
AFS securities	3,406	3,299
Derivative Liability	0	0
Recurring items [Member] | Level 1 [Member] | Government sponsored enterprises [Member]
AFS Securities
AFS securities	0	0
Recurring items [Member] | Level 1 [Member] | States and political subdivisions [Member]
AFS Securities
AFS securities	0	0
Recurring items [Member] | Level 1 [Member] | Auction rate money market preferred [Member]
AFS Securities
AFS securities	0	0
Recurring items [Member] | Level 1 [Member] | Preferred stock [Member]
AFS Securities
AFS securities	3,406	3,299
Recurring items [Member] | Level 1 [Member] | Mortgage-backed securities [Member]
AFS Securities
AFS securities	0	0
Recurring items [Member] | Level 1 [Member] | Collateralized mortgage obligations [Member]
AFS Securities
AFS securities	0	0
Recurring items [Member] | Level 2 [Member]
AFS Securities
AFS securities	599,057	656,837
Derivative Liability	(152)	0
Recurring items [Member] | Level 2 [Member] | Government sponsored enterprises [Member]
AFS Securities
AFS securities	10,371	24,345
Recurring items [Member] | Level 2 [Member] | States and political subdivisions [Member]
AFS Securities
AFS securities	226,047	232,217
Recurring items [Member] | Level 2 [Member] | Auction rate money market preferred [Member]
AFS Securities
AFS securities	3,119	2,866
Recurring items [Member] | Level 2 [Member] | Preferred stock [Member]
AFS Securities
AFS securities	0	0
Recurring items [Member] | Level 2 [Member] | Mortgage-backed securities [Member]
AFS Securities
AFS securities	240,195	263,384
Recurring items [Member] | Level 2 [Member] | Collateralized mortgage obligations [Member]
AFS Securities
AFS securities	119,325	134,025
Recurring items [Member] | Level 3 [Member]
AFS Securities
AFS securities	0	0
Derivative Liability	0	0
Recurring items [Member] | Level 3 [Member] | Government sponsored enterprises [Member]
AFS Securities
AFS securities	0	0
Recurring items [Member] | Level 3 [Member] | States and political subdivisions [Member]
AFS Securities
AFS securities	0	0
Recurring items [Member] | Level 3 [Member] | Auction rate money market preferred [Member]
AFS Securities
AFS securities	0	0
Recurring items [Member] | Level 3 [Member] | Preferred stock [Member]
AFS Securities
AFS securities	0	0
Recurring items [Member] | Level 3 [Member] | Mortgage-backed securities [Member]
AFS Securities
AFS securities	0	0
Recurring items [Member] | Level 3 [Member] | Collateralized mortgage obligations [Member]
AFS Securities
AFS securities	0	0
Nonrecurring items [Member]
AFS Securities
Impaired loans (net of the allowance for loan losses)	7,687	9,301
Foreclosed assets	249	421
Nonrecurring items [Member] | Level 1 [Member]
AFS Securities
Impaired loans (net of the allowance for loan losses)	0	0
Foreclosed assets	0	0
Nonrecurring items [Member] | Level 2 [Member]
AFS Securities
Impaired loans (net of the allowance for loan losses)	0	0
Foreclosed assets	0	0
Nonrecurring items [Member] | Level 3 [Member]
AFS Securities
Impaired loans (net of the allowance for loan losses)	7,687	9,301
Foreclosed assets	$ 249	$ 421