Securities - (Details 4) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($) security	Dec. 31, 2014 USD ($) security
Held to Maturity:
Number of positions (securities) | security	64	47
Fair Value, Less than 12 Months	$ 72,196	$ 4,353
Fair Value, 12 Months or More	58,911	129,226
Fair Value, Total	131,107	133,579
Unrealized Losses, Less than 12 months	(535)	(30)
Unrealized Losses, 12 Months or More	(758)	(3,083)
Unrealized Losses, Total	$ (1,293)	$ (3,113)
Available for Sale:
Number of positions (securities) | security	51	49
Fair Value, Less than 12 Months	$ 63,596	$ 51,093
Fair Value, 12 Months or More	107,142	152,374
Fair Value, Total	170,738	203,467
Unrealized losses, Less than 12 months	(232)	(177)
Unrealized Losses, 12 months or More	(8,155)	(10,289)
Unrealized Losses, Total	$ (8,387)	$ (10,466)
Trust preferred securities
Available for Sale:
Number of positions (securities) | security	3	3
Fair Value, Less than 12 Months	$ 0	$ 0
Fair Value, 12 Months or More	18,890	18,503
Fair Value, Total	18,890	18,503
Unrealized losses, Less than 12 months	0	0
Unrealized Losses, 12 months or More	(5,917)	(6,781)
Unrealized Losses, Total	$ (5,917)	$ (6,781)
Other debt securities
Available for Sale:
Number of positions (securities) | security	2	2
Fair Value, Less than 12 Months	$ 0	$ 0
Fair Value, 12 Months or More	4,051	4,175
Fair Value, Total	4,051	4,175
Unrealized losses, Less than 12 months	0	0
Unrealized Losses, 12 months or More	(20)	(74)
Unrealized Losses, Total	$ (20)	$ (74)
Other equity securities
Available for Sale:
Number of positions (securities) | security		0
Fair Value, Less than 12 Months		$ 0
Fair Value, 12 Months or More		0
Fair Value, Total		0
Unrealized losses, Less than 12 months		0
Unrealized Losses, 12 months or More		0
Unrealized Losses, Total		$ 0
Obligations of other U.S. Government agencies and corporations
Held to Maturity:
Number of positions (securities) | security	23	28
Fair Value, Less than 12 Months	$ 45,255	$ 1,000
Fair Value, 12 Months or More	55,050	119,174
Fair Value, Total	100,305	120,174
Unrealized Losses, Less than 12 months	(230)	(1)
Unrealized Losses, 12 Months or More	(653)	(2,914)
Unrealized Losses, Total	$ (883)	$ (2,915)
Available for Sale:
Number of positions (securities) | security	1	1
Fair Value, Less than 12 Months	$ 3,998	$ 0
Fair Value, 12 Months or More	0	3,881
Fair Value, Total	3,998	3,881
Unrealized losses, Less than 12 months	(2)	0
Unrealized Losses, 12 months or More	0	(119)
Unrealized Losses, Total	$ (2)	$ (119)
Obligations of states and political subdivisions
Held to Maturity:
Number of positions (securities) | security	41	19
Fair Value, Less than 12 Months	$ 26,941	$ 3,353
Fair Value, 12 Months or More	3,861	10,052
Fair Value, Total	30,802	13,405
Unrealized Losses, Less than 12 months	(305)	(29)
Unrealized Losses, 12 Months or More	(105)	(169)
Unrealized Losses, Total	$ (410)	$ (198)
Government agency mortgage backed securities | Residential mortgage backed securities:
Available for Sale:
Number of positions (securities) | security	23	16
Fair Value, Less than 12 Months	$ 51,459	$ 18,924
Fair Value, 12 Months or More	28,867	49,612
Fair Value, Total	80,326	68,536
Unrealized losses, Less than 12 months	(184)	(39)
Unrealized Losses, 12 months or More	(708)	(793)
Unrealized Losses, Total	$ (892)	$ (832)
Government agency mortgage backed securities | Commercial mortgage backed securities:
Available for Sale:
Number of positions (securities) | security	3	3
Fair Value, Less than 12 Months	$ 1,144	$ 0
Fair Value, 12 Months or More	820	10,651
Fair Value, Total	1,964	10,651
Unrealized losses, Less than 12 months	(11)	0
Unrealized Losses, 12 months or More	(3)	(137)
Unrealized Losses, Total	$ (14)	$ (137)
Government agency collateralized mortgage obligations | Residential mortgage backed securities:
Available for Sale:
Number of positions (securities) | security	19	24
Fair Value, Less than 12 Months	$ 6,995	$ 32,169
Fair Value, 12 Months or More	54,514	65,552
Fair Value, Total	61,509	97,721
Unrealized losses, Less than 12 months	(35)	(138)
Unrealized Losses, 12 months or More	(1,507)	(2,385)
Unrealized Losses, Total	$ (1,542)	$ (2,523)
Government agency collateralized mortgage obligations | Commercial mortgage backed securities:
Available for Sale:
Number of positions (securities) | security	0	0
Fair Value, Less than 12 Months	$ 0	$ 0
Fair Value, 12 Months or More	0	0
Fair Value, Total	0	0
Unrealized losses, Less than 12 months	0	0
Unrealized Losses, 12 months or More	0	0
Unrealized Losses, Total	$ 0	$ 0
Less than 12 Months
Held to Maturity:
Number of positions (securities) | security	46	5
Available for Sale:
Number of positions (securities) | security	20	9
Less than 12 Months | Trust preferred securities
Available for Sale:
Number of positions (securities) | security	0	0
Less than 12 Months | Other debt securities
Available for Sale:
Number of positions (securities) | security	0	0
Less than 12 Months | Other equity securities
Available for Sale:
Number of positions (securities) | security		0
Less than 12 Months | Obligations of other U.S. Government agencies and corporations
Held to Maturity:
Number of positions (securities) | security	11	2
Available for Sale:
Number of positions (securities) | security	1	0
Less than 12 Months | Obligations of states and political subdivisions
Held to Maturity:
Number of positions (securities) | security	35	3
Less than 12 Months | Government agency mortgage backed securities | Residential mortgage backed securities:
Available for Sale:
Number of positions (securities) | security	14	3
Less than 12 Months | Government agency mortgage backed securities | Commercial mortgage backed securities:
Available for Sale:
Number of positions (securities) | security	2	0
Less than 12 Months | Government agency collateralized mortgage obligations | Residential mortgage backed securities:
Available for Sale:
Number of positions (securities) | security	3	6
Less than 12 Months | Government agency collateralized mortgage obligations | Commercial mortgage backed securities:
Available for Sale:
Number of positions (securities) | security	0	0
12 Months or More
Held to Maturity:
Number of positions (securities) | security	18	42
Available for Sale:
Number of positions (securities) | security	31	40
12 Months or More | Trust preferred securities
Available for Sale:
Number of positions (securities) | security	3	3
12 Months or More | Other debt securities
Available for Sale:
Number of positions (securities) | security	2	2
12 Months or More | Other equity securities
Available for Sale:
Number of positions (securities) | security		0
12 Months or More | Obligations of other U.S. Government agencies and corporations
Held to Maturity:
Number of positions (securities) | security	12	26
Available for Sale:
Number of positions (securities) | security	0	1
12 Months or More | Obligations of states and political subdivisions
Held to Maturity:
Number of positions (securities) | security	6	16
12 Months or More | Government agency mortgage backed securities | Residential mortgage backed securities:
Available for Sale:
Number of positions (securities) | security	9	13
12 Months or More | Government agency mortgage backed securities | Commercial mortgage backed securities:
Available for Sale:
Number of positions (securities) | security	1	3
12 Months or More | Government agency collateralized mortgage obligations | Residential mortgage backed securities:
Available for Sale:
Number of positions (securities) | security	16	18
12 Months or More | Government agency collateralized mortgage obligations | Commercial mortgage backed securities:
Available for Sale:
Number of positions (securities) | security	0	0