Investment Securities Available for Sale (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Market Value	$ 181,976	$ 269,100
In loss position for Less than 12 months, Fair Value	15,991	151,724
In loss position for Less than 12 months, Unrealized Losses	(77)	(2,150)
In loss position for 12 months or more, Fair Value	0	15,934
In loss position for 12 months or more, Unrealized Losses	0	(1,529)
Total Fair Value	15,991	167,658
Total Unrealized Losses	(77)	(3,679)
Gross realized gains on sales	13,727	275	$ 5,538
Gross realized losses on sales	(2,589)	(286)	(386)
Gains (losses) on sale of investment securities available for sale	11,138	(11)	5,152
Gross realized losses on other-than-temporary impairments	(12,846)	0	0
Proceeds from investment securities sales	270,576	154,615	117,021
Proceeds from early redemptions by issuers	14,230	2,779	$ 708
Chief Executive Officer [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross realized losses on other-than-temporary impairments	(6,895)
Marketable equity securities
Schedule of Available-for-sale Securities [Line Items]
Market Value	67,273	77,609
In loss position for Less than 12 months, Fair Value	5,938	6,599
In loss position for Less than 12 months, Unrealized Losses	(62)	(138)
In loss position for 12 months or more, Fair Value	0	3,534
In loss position for 12 months or more, Unrealized Losses	0	(966)
Total Fair Value	5,938	10,133
Total Unrealized Losses	(62)	(1,104)
Mutual funds invested in fixed income securities
Schedule of Available-for-sale Securities [Line Items]
Market Value	20,111	59,826
In loss position for Less than 12 months, Fair Value	10,053	59,826
In loss position for Less than 12 months, Unrealized Losses	$ (15)	(1,659)
In loss position for 12 months or more, Fair Value		0
In loss position for 12 months or more, Unrealized Losses		0
Total Fair Value	$ 10,053	59,826
Total Unrealized Losses	(15)	(1,659)
U.S. Government securities
Schedule of Available-for-sale Securities [Line Items]
Under 1 Year	0
1 Year up to 5 Years	28,132
More than 5 Years	0
Market Value	28,132
In loss position for Less than 12 months, Fair Value		22,375
In loss position for Less than 12 months, Unrealized Losses		(18)
In loss position for 12 months or more, Fair Value		0
In loss position for 12 months or more, Unrealized Losses		0
Total Fair Value		22,375
Total Unrealized Losses		(18)
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Under 1 Year	2,154
1 Year up to 5 Years	39,347
More than 5 Years	60
Market Value	41,561
In loss position for Less than 12 months, Fair Value		30,896
In loss position for Less than 12 months, Unrealized Losses		(204)
In loss position for 12 months or more, Fair Value		7,224
In loss position for 12 months or more, Unrealized Losses		(131)
Total Fair Value		38,120
Total Unrealized Losses		(335)
U.S. mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Under 1 Year	636
1 Year up to 5 Years	5,003
More than 5 Years	151
Market Value	5,790
In loss position for Less than 12 months, Fair Value		3,370
In loss position for Less than 12 months, Unrealized Losses		(26)
In loss position for 12 months or more, Fair Value		0
In loss position for 12 months or more, Unrealized Losses		0
Total Fair Value		3,370
Total Unrealized Losses		(26)
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Under 1 Year	5,739
1 Year up to 5 Years	715
More than 5 Years	2,274
Market Value	8,728
In loss position for Less than 12 months, Fair Value		11,332
In loss position for Less than 12 months, Unrealized Losses		(46)
In loss position for 12 months or more, Fair Value		5,176
In loss position for 12 months or more, Unrealized Losses		(432)
Total Fair Value		16,508
Total Unrealized Losses		(478)
U.S. asset backed securities
Schedule of Available-for-sale Securities [Line Items]
Under 1 Year	2,342
1 Year up to 5 Years	5,934
More than 5 Years	0
Market Value	8,276
In loss position for Less than 12 months, Fair Value		15,228
In loss position for Less than 12 months, Unrealized Losses		(29)
In loss position for 12 months or more, Fair Value		0
In loss position for 12 months or more, Unrealized Losses		0
Total Fair Value		15,228
Total Unrealized Losses		(29)
Index-linked U.S. bonds
Schedule of Available-for-sale Securities [Line Items]
Under 1 Year	0
1 Year up to 5 Years	2,105
More than 5 Years	0
Market Value	2,105
In loss position for Less than 12 months, Fair Value		2,098
In loss position for Less than 12 months, Unrealized Losses		(30)
In loss position for 12 months or more, Fair Value		0
In loss position for 12 months or more, Unrealized Losses		0
Total Fair Value		2,098
Total Unrealized Losses		$ (30)
Marketable debt securities
Schedule of Available-for-sale Securities [Line Items]
Under 1 Year	10,871
1 Year up to 5 Years	81,236
More than 5 Years	2,485
Market Value	$ 94,592