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Securities Available for Sale - Amortized Cost and Estimated Fair Value (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Amortized Cost - Due within one year	$ 340,000
Amortized Cost - Due after one year through five years	755,000
Amortized Cost - Due after five years through ten years	3,410,000
Amortized Cost - Due after ten years	5,691,000
Amortized Cost	713,477,000	723,401,000
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Estimated Fair Value - Due within one year	346,000
Estimated Fair Value - Due after one year through five years	847,000
Estimated Fair Value - Due after five years through ten years	3,778,000
Estimated Fair Value - Due after ten years	5,197,000
Estimated Fair Value	710,625,000	705,751,000
Available-for-sale Securities, Restricted	364,700,000	362,300,000
GSE collateralized mortgage obligations
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Amortized Cost - no single maturity date	277,954,000
Amortized Cost	277,954,000	286,608,000
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Estimated Fair Value - no single maturity date	273,417,000
Estimated Fair Value	273,417,000	274,101,000
GSE mortgage-backed securities
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Amortized Cost - no single maturity date	407,902,000
Amortized Cost	407,902,000	409,165,000
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Estimated Fair Value - no single maturity date	409,809,000
Estimated Fair Value	409,809,000	404,996,000
Mutual funds - GSE mortgage related securities
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Amortized Cost - no single maturity date	17,425,000
Amortized Cost	17,425,000	17,425,000
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Estimated Fair Value - no single maturity date	17,231,000
Estimated Fair Value	$ 17,231,000	$ 17,021,000

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