Securities (Unrealized Loss NOT deemed to be OTTI) (Details) $ in Thousands	Jun. 30, 2015 USD ($) holding	Dec. 31, 2014 USD ($) holding
Summary of gross unrealized losses and fair value of investments
No of holdings | holding	86	80
Fair value, less than 12 months	$ 166,226	$ 64,537
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	(1,484)	(467)
Fair value, 12 months or longer	99,135	143,949
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	(3,985)	(5,981)
Fair value, Total	265,361	208,486
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss	$ (5,469)	$ (6,448)
U. S. Government Agency Securities [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings | holding		22
Fair value, less than 12 months		$ 21,950
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months		(22)
Fair value, 12 months or longer		0
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months		0
Fair value, Total		21,950
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss		$ (22)
Agency mortgage-backed securities
Summary of gross unrealized losses and fair value of investments
No of holdings | holding	40	17
Fair value, less than 12 months	$ 76,234	$ 3,471
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	(766)	(1)
Fair value, 12 months or longer	4,542	42,222
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	(180)	(692)
Fair value, Total	80,776	45,693
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss	$ (946)	$ (693)
Agency Collateralized Mortgage Obligations [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings | holding	14	14
Fair value, less than 12 months	$ 45,813	$ 35,083
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	(329)	(331)
Fair value, 12 months or longer	88,668	94,974
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	(2,941)	(3,770)
Fair value, Total	134,481	130,057
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss	$ (3,270)	$ (4,101)
Single issuer trust preferred securities issued by banks and insurers
Summary of gross unrealized losses and fair value of investments
No of holdings | holding	2	2
Fair value, less than 12 months	$ 2,113	$ 2,553
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	(28)	(39)
Fair value, 12 months or longer	0	0
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	0	0
Fair value, Total	2,113	2,553
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss	$ (28)	$ (39)
Pooled trust preferred securities issued by banks and insurers
Summary of gross unrealized losses and fair value of investments
No of holdings | holding	1	2
Fair value, less than 12 months	$ 0	$ 0
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	0	0
Fair value, 12 months or longer	1,595	2,681
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	(651)	(1,356)
Fair value, Total	1,595	2,681
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss	$ (651)	$ (1,356)
Equity securities
Summary of gross unrealized losses and fair value of investments
No of holdings | holding	26	23
Fair value, less than 12 months	$ 2,717	$ 1,480
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	(123)	(74)
Fair value, 12 months or longer	4,330	4,072
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	(213)	(163)
Fair value, Total	7,047	5,552
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss	$ (336)	$ (237)
Small Business Administration Pooled Securities [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings | holding	3
Fair value, less than 12 months	$ 39,349
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	(238)
Fair value, 12 months or longer	0
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	0
Fair value, Total	39,349
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss	$ (238)