Investments Available for Sale Securities in Unrealized Loss Position (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 324,580
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(5,480)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	55,641
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(2,158)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	380,221
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(7,638)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	103
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	100,444
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	(1,112)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	100,444
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss	(1,112)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	10.00
US Government and Government Agencies and Authorities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,118
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(27)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,118
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(27)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	1
US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	152,058
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(1,031)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	152,058
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(1,031)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	14
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	90,165
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(1,734)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	4,354
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(164)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	94,519
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(1,898)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	51
Mortgage Backed Securities, Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	82,309
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(2,711)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	50,169
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(1,967)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	132,478
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(4,678)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	31
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	100,444
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	(1,112)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	100,444
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss	(1,112)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	10
Other Aggregated Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	48
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(4)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	48
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	$ (4)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	6