Securities (Details 4) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014 security	Dec. 31, 2013 security
Cash and Cash Equivalents [Line Items]
Number of positions (securities)	81	141
Held-to-maturity Securities [Abstract]
Fair Value, Less than 12 Months	$ 22,934	$ 165,250
Unrealized Losses, Less than 12 months	(167)	(10,404)
Fair Value, 12 Months or More	135,279	10,023
Unrealized Losses, 12 Months or More	(5,250)	(1,006)
Fair Value, Total	158,213	175,273
Unrealized Losses, Total	(5,417)	(11,410)
Available-for-sale Securities [Abstract]
Number of positions (securities)	64	68
Fair Value, Less than 12 Months	86,418	230,823
Unrealized Losses, Less than 12 months	(488)	(7,921)
Fair Value, 12 Months or More	177,864	48,342
Unrealized Losses, 12 months or More	(15,081)	(12,120)
Fair Value, Total	264,282	279,165
Unrealized Losses, Total	(15,569)	(20,041)
Trust preferred securities
Available-for-sale Securities [Abstract]
Number of positions (securities)	3	3
Fair Value, Less than 12 Months	0	0
Unrealized Losses, Less than 12 months	0	0
Fair Value, 12 Months or More	17,102	16,456
Unrealized Losses, 12 months or More	(9,154)	(9,933)
Fair Value, Total	17,102	16,456
Unrealized Losses, Total	(9,154)	(9,933)
Other debt securities
Available-for-sale Securities [Abstract]
Number of positions (securities)	2	4
Fair Value, Less than 12 Months	0	7,100
Unrealized Losses, Less than 12 months	0	(217)
Fair Value, 12 Months or More	4,424	1,897
Unrealized Losses, 12 months or More	(124)	(13)
Fair Value, Total	4,424	8,997
Unrealized Losses, Total	(124)	(230)
Other equity securities
Available-for-sale Securities [Abstract]
Number of positions (securities)		0
Fair Value, Less than 12 Months		0
Unrealized Losses, Less than 12 months		0
Fair Value, 12 Months or More		0
Unrealized Losses, 12 months or More		0
Fair Value, Total		0
Unrealized Losses, Total		0
Obligations of other U.S. Government agencies and corporations
Cash and Cash Equivalents [Line Items]
Number of positions (securities)	28	28
Held-to-maturity Securities [Abstract]
Fair Value, Less than 12 Months	500	105,747
Unrealized Losses, Less than 12 months	(1)	(7,826)
Fair Value, 12 Months or More	117,932	9,090
Unrealized Losses, 12 Months or More	(4,643)	(901)
Fair Value, Total	118,432	114,837
Unrealized Losses, Total	(4,644)	(8,727)
Available-for-sale Securities [Abstract]
Number of positions (securities)	1	1
Fair Value, Less than 12 Months	0	3,799
Unrealized Losses, Less than 12 months	0	(201)
Fair Value, 12 Months or More	3,842	0
Unrealized Losses, 12 months or More	(158)	0
Fair Value, Total	3,842	3,799
Unrealized Losses, Total	(158)	(201)
Obligations of states and political subdivisions
Cash and Cash Equivalents [Line Items]
Number of positions (securities)	53	113
Held-to-maturity Securities [Abstract]
Fair Value, Less than 12 Months	22,434	59,503
Unrealized Losses, Less than 12 months	(166)	(2,578)
Fair Value, 12 Months or More	17,347	933
Unrealized Losses, 12 Months or More	(607)	(105)
Fair Value, Total	39,781	60,436
Unrealized Losses, Total	(773)	(2,683)
Government agency mortgage backed securities | Residential mortgage backed securities:
Available-for-sale Securities [Abstract]
Number of positions (securities)	29	35
Fair Value, Less than 12 Months	48,735	134,858
Unrealized Losses, Less than 12 months	(91)	(3,451)
Fair Value, 12 Months or More	71,908	13,239
Unrealized Losses, 12 months or More	(1,805)	(963)
Fair Value, Total	120,643	148,097
Unrealized Losses, Total	(1,896)	(4,414)
Government agency mortgage backed securities | Commercial mortgage backed securities:
Available-for-sale Securities [Abstract]
Number of positions (securities)	4	4
Fair Value, Less than 12 Months	5,275	16,570
Unrealized Losses, Less than 12 months	(26)	(584)
Fair Value, 12 Months or More	10,538	0
Unrealized Losses, 12 months or More	(321)	0
Fair Value, Total	15,813	16,570
Unrealized Losses, Total	(347)	(584)
Government agency collateralized mortgage obligations | Residential mortgage backed securities:
Available-for-sale Securities [Abstract]
Number of positions (securities)	25	21
Fair Value, Less than 12 Months	32,408	68,496
Unrealized Losses, Less than 12 months	(371)	(3,468)
Fair Value, 12 Months or More	70,050	16,750
Unrealized Losses, 12 months or More	(3,519)	(1,211)
Fair Value, Total	102,458	85,246
Unrealized Losses, Total	(3,890)	(4,679)
Government agency collateralized mortgage obligations | Commercial mortgage backed securities:
Available-for-sale Securities [Abstract]
Number of positions (securities)	0	0
Fair Value, Less than 12 Months	0	0
Unrealized Losses, Less than 12 months	0	0
Fair Value, 12 Months or More	0	0
Unrealized Losses, 12 months or More	0	0
Fair Value, Total	0	0
Unrealized Losses, Total	$ 0	$ 0
Less than 12 Months
Cash and Cash Equivalents [Line Items]
Number of positions (securities)	27	137
Available-for-sale Securities [Abstract]
Number of positions (securities)	18	57
Less than 12 Months | Trust preferred securities
Available-for-sale Securities [Abstract]
Number of positions (securities)		0
Less than 12 Months | Other debt securities
Available-for-sale Securities [Abstract]
Number of positions (securities)		3
Less than 12 Months | Other equity securities
Available-for-sale Securities [Abstract]
Number of positions (securities)		0
Less than 12 Months | Obligations of other U.S. Government agencies and corporations
Cash and Cash Equivalents [Line Items]
Number of positions (securities)	1	26
Available-for-sale Securities [Abstract]
Number of positions (securities)	0	1
Less than 12 Months | Obligations of states and political subdivisions
Cash and Cash Equivalents [Line Items]
Number of positions (securities)	26	111
Less than 12 Months | Government agency mortgage backed securities | Residential mortgage backed securities:
Available-for-sale Securities [Abstract]
Number of positions (securities)	10	32
Less than 12 Months | Government agency mortgage backed securities | Commercial mortgage backed securities:
Available-for-sale Securities [Abstract]
Number of positions (securities)	1	4
Less than 12 Months | Government agency collateralized mortgage obligations | Residential mortgage backed securities:
Available-for-sale Securities [Abstract]
Number of positions (securities)	7	17
Less than 12 Months | Government agency collateralized mortgage obligations | Commercial mortgage backed securities:
Available-for-sale Securities [Abstract]
Number of positions (securities)		0
12 Months or More
Cash and Cash Equivalents [Line Items]
Number of positions (securities)	54	4
Available-for-sale Securities [Abstract]
Number of positions (securities)	46	11
12 Months or More | Trust preferred securities
Available-for-sale Securities [Abstract]
Number of positions (securities)	3	3
12 Months or More | Other debt securities
Available-for-sale Securities [Abstract]
Number of positions (securities)	2	1
12 Months or More | Other equity securities
Available-for-sale Securities [Abstract]
Number of positions (securities)		0
12 Months or More | Obligations of other U.S. Government agencies and corporations
Cash and Cash Equivalents [Line Items]
Number of positions (securities)	27	2
Available-for-sale Securities [Abstract]
Number of positions (securities)	1	0
12 Months or More | Obligations of states and political subdivisions
Cash and Cash Equivalents [Line Items]
Number of positions (securities)	27	2
12 Months or More | Government agency mortgage backed securities | Residential mortgage backed securities:
Available-for-sale Securities [Abstract]
Number of positions (securities)	19	3
12 Months or More | Government agency mortgage backed securities | Commercial mortgage backed securities:
Available-for-sale Securities [Abstract]
Number of positions (securities)	3	0
12 Months or More | Government agency collateralized mortgage obligations | Residential mortgage backed securities:
Available-for-sale Securities [Abstract]
Number of positions (securities)	18	4
12 Months or More | Government agency collateralized mortgage obligations | Commercial mortgage backed securities:
Available-for-sale Securities [Abstract]
Number of positions (securities)		0