Trading Securities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Schedule of Trading Securities [Line Items]
Trading Securities, Fair Value	$ 91,616,000	$ 214,102,000
Trading Securities, Net Unrealized Gain (Loss)	11,000	151,000
U.S. Government agency debentures [Member]
Schedule of Trading Securities [Line Items]
Trading Securities, Fair Value	34,120,000	16,545,000
Trading Securities, Net Unrealized Gain (Loss)	77,000	(57,000)
U.S. agency residential mortgage-backed securities [Member]
Schedule of Trading Securities [Line Items]
Trading Securities, Fair Value	21,011,000	86,361,000
Trading Securities, Net Unrealized Gain (Loss)	123,000	447,000
Municipal and other tax-exempt securities [Member]
Schedule of Trading Securities [Line Items]
Trading Securities, Fair Value	27,350,000	90,326,000
Trading Securities, Net Unrealized Gain (Loss)	(182,000)	(226,000)
Trading Securities Pledged as Collateral	0	13,000,000
Other trading securities [Member]
Schedule of Trading Securities [Line Items]
Trading Securities, Fair Value	9,135,000	20,870,000
Trading Securities, Net Unrealized Gain (Loss)	$ (7,000)	$ (13,000)