Securities (Unrealized Loss NOT deemed to be OTTI) (Details) $ in Thousands	Jun. 30, 2016 USD ($) holding	Dec. 31, 2015 USD ($) holding
Summary of gross unrealized losses and fair value of investments
No of holdings | holding	36	123
Fair value, less than 12 months	$ 842	$ 304,830
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	(25)	(2,882)
Fair value, 12 months or longer	64,378	92,785
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	(1,615)	(4,196)
Fair value, Total	65,220	397,615
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss	$ (1,640)	$ (7,078)
U. S. Government Agency Securities [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings | holding		3
Fair value, less than 12 months		$ 1,990
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months		(4)
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		1,990
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss		$ (4)
Agency mortgage-backed securities
Summary of gross unrealized losses and fair value of investments
No of holdings | holding	1	57
Fair value, less than 12 months	$ 434	$ 112,648
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	(3)	(1,062)
Fair value, 12 months or longer	0	4,297
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	0	(140)
Fair value, Total	434	116,945
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss	$ (3)	$ (1,202)
Agency Collateralized Mortgage Obligations [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings | holding	7	23
Fair value, less than 12 months	$ 0	$ 147,707
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	0	(1,420)
Fair value, 12 months or longer	54,467	80,927
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	(569)	(2,984)
Fair value, Total	54,467	228,634
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss	$ (569)	$ (4,404)
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	$ 0	$ 1,018
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	0	(33)
Fair value, 12 months or longer	2,014	1,018
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	(78)	(48)
Fair value, Total	2,014	2,036
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss	$ (78)	$ (81)
Pooled trust preferred securities issued by banks and insurers
Summary of gross unrealized losses and fair value of investments
No of holdings | holding	1	1
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	1,506	1,572
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	(703)	(645)
Fair value, Total	1,506	1,572
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss	$ (703)	$ (645)
Equity securities
Summary of gross unrealized losses and fair value of investments
No of holdings | holding	25	34
Fair value, less than 12 months	$ 408	$ 3,481
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	(22)	(189)
Fair value, 12 months or longer	6,391	4,971
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	(265)	(379)
Fair value, Total	6,799	8,452
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss	$ (287)	$ (568)
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		$ 37,986
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months		(174)
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		37,986
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss		$ (174)