Securities - (Details 3) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015 USD ($) security	Dec. 31, 2014 USD ($) security
Held to Maturity:
Number of positions (securities) | security	79	47
Fair Value, Less than 12 Months	$ 65,116	$ 4,353
Fair Value, 12 Months or More	94,882	129,226
Fair Value, Total	159,998	133,579
Unrealized Losses, Less than 12 months	(1,367)	(30)
Unrealized Losses, 12 Months or More	(2,205)	(3,083)
Unrealized Losses, Total	$ (3,572)	$ (3,113)
Available for Sale:
Number of positions (securities) | security	64	49
Fair Value, Less than 12 Months	$ 134,467	$ 51,093
Fair Value, 12 Months or More	119,128	152,374
Fair Value, Total	253,595	203,467
Unrealized losses, Less than 12 months	(1,067)	(177)
Unrealized Losses, 12 months or More	(9,369)	(10,289)
Unrealized Losses, Total	$ (10,436)	$ (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	19,127	18,503
Fair Value, Total	19,127	18,503
Unrealized losses, Less than 12 months	0	0
Unrealized Losses, 12 months or More	(5,717)	(6,781)
Unrealized Losses, Total	$ (5,717)	$ (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	4,040	4,175
Fair Value, Total	4,040	4,175
Unrealized losses, Less than 12 months	0	0
Unrealized Losses, 12 months or More	(52)	(74)
Unrealized Losses, Total	$ (52)	$ (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	27	28
Fair Value, Less than 12 Months	$ 25,399	$ 1,000
Fair Value, 12 Months or More	91,100	119,174
Fair Value, Total	116,499	120,174
Unrealized Losses, Less than 12 months	(586)	(1)
Unrealized Losses, 12 Months or More	(2,017)	(2,914)
Unrealized Losses, Total	$ (2,603)	$ (2,915)
Available for Sale:
Number of positions (securities) | security	1	1
Fair Value, Less than 12 Months	$ 0	$ 0
Fair Value, 12 Months or More	3,954	3,881
Fair Value, Total	3,954	3,881
Unrealized losses, Less than 12 months	0	0
Unrealized Losses, 12 months or More	(46)	(119)
Unrealized Losses, Total	$ (46)	$ (119)
Obligations of states and political subdivisions
Held to Maturity:
Number of positions (securities) | security	52	19
Fair Value, Less than 12 Months	$ 39,717	$ 3,353
Fair Value, 12 Months or More	3,782	10,052
Fair Value, Total	43,499	13,405
Unrealized Losses, Less than 12 months	(781)	(29)
Unrealized Losses, 12 Months or More	(188)	(169)
Unrealized Losses, Total	$ (969)	$ (198)
Government agency mortgage backed securities | Residential mortgage backed securities:
Available for Sale:
Number of positions (securities) | security	34	16
Fair Value, Less than 12 Months	$ 102,829	$ 18,924
Fair Value, 12 Months or More	29,712	49,612
Fair Value, Total	132,541	68,536
Unrealized losses, Less than 12 months	(885)	(39)
Unrealized Losses, 12 months or More	(1,136)	(793)
Unrealized Losses, Total	$ (2,021)	$ (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	$ 4,804	$ 0
Fair Value, 12 Months or More	5,812	10,651
Fair Value, Total	10,616	10,651
Unrealized losses, Less than 12 months	(28)	0
Unrealized Losses, 12 months or More	(74)	(137)
Unrealized Losses, Total	$ (102)	$ (137)
Government agency collateralized mortgage obligations | Residential mortgage backed securities:
Available for Sale:
Number of positions (securities) | security	21	24
Fair Value, Less than 12 Months	$ 26,834	$ 32,169
Fair Value, 12 Months or More	56,483	65,552
Fair Value, Total	83,317	97,721
Unrealized losses, Less than 12 months	(154)	(138)
Unrealized Losses, 12 months or More	(2,344)	(2,385)
Unrealized Losses, Total	$ (2,498)	$ (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	53	5
Available for Sale:
Number of positions (securities) | security	31	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	7	2
Available for Sale:
Number of positions (securities) | security	0	0
Less than 12 Months | Obligations of states and political subdivisions
Held to Maturity:
Number of positions (securities) | security	46	3
Less than 12 Months | Government agency mortgage backed securities | Residential mortgage backed securities:
Available for Sale:
Number of positions (securities) | security	25	3
Less than 12 Months | Government agency mortgage backed securities | Commercial mortgage backed securities:
Available for Sale:
Number of positions (securities) | security	1	0
Less than 12 Months | Government agency collateralized mortgage obligations | Residential mortgage backed securities:
Available for Sale:
Number of positions (securities) | security	5	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	26	42
Available for Sale:
Number of positions (securities) | security	33	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	20	26
Available for Sale:
Number of positions (securities) | security	1	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	2	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