Fair Value (Recorded amount of assets and liabilities measured at fair value) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
AFS Securities
AFS securities	$ 660,136	$ 567,534
Fair value, total	669,858	577,139
Level 1 [Member]
AFS Securities
Fair value, total	$ 3,299	$ 6,140
Percent of assets and liabilities measured at fair value	0.49%	1.06%
Level 2 [Member]
AFS Securities
Fair value, total	$ 656,837	$ 561,394
Percent of assets and liabilities measured at fair value	98.06%	97.27%
Level 3 [Member]
AFS Securities
Fair value, total	$ 9,722	$ 9,605
Percent of assets and liabilities measured at fair value	1.45%	1.67%
Recurring items [Member]
AFS Securities
AFS securities	$ 660,136	$ 567,534
Recurring items [Member] | Government sponsored enterprises [Member]
AFS Securities
AFS securities	24,345	24,136
Recurring items [Member] | States and political subdivisions [Member]
AFS Securities
AFS securities	232,217	215,345
Recurring items [Member] | Auction rate money market preferred [Member]
AFS Securities
AFS securities	2,866	2,619
Recurring items [Member] | Preferred stock [Member]
AFS Securities
AFS securities	3,299	6,140
Recurring items [Member] | Mortgage-backed securities [Member]
AFS Securities
AFS securities	263,384	166,926
Recurring items [Member] | Collateralized mortgage obligations [Member]
AFS Securities
AFS securities	134,025	152,368
Recurring items [Member] | Level 1 [Member]
AFS Securities
AFS securities	3,299	6,140
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	3,299	6,140
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	656,837	561,394
Recurring items [Member] | Level 2 [Member] | Government sponsored enterprises [Member]
AFS Securities
AFS securities	24,345	24,136
Recurring items [Member] | Level 2 [Member] | States and political subdivisions [Member]
AFS Securities
AFS securities	232,217	215,345
Recurring items [Member] | Level 2 [Member] | Auction rate money market preferred [Member]
AFS Securities
AFS securities	2,866	2,619
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	263,384	166,926
Recurring items [Member] | Level 2 [Member] | Collateralized mortgage obligations [Member]
AFS Securities
AFS securities	134,025	152,368
Recurring items [Member] | Level 3 [Member]
AFS Securities
AFS securities	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)	9,301	8,720
Foreclosed assets	421	885
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)	9,301	8,720
Foreclosed assets	$ 421	$ 885