Investment Securities, Contract Maturity (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Amortized Cost [Abstract]
Within One Year	$ 20,191
After One Year Through Five Years	55,970
After Five Years Through Ten Years	3,267
After Ten Years	0
Amortized cost, before single maturity date	79,428
Investment Securities Not Due at a Single Maturity Date - Mortgage-backed Securities	329,469
Amortized cost, Total	408,897
Fair/Book Value [Abstract]
Within One Year	20,229
After One Year Through Five Years	56,132
After Five Years Through Ten Years	3,349
After Ten Years	0
Fair/Book Value, before single maturity date	79,710
Investment Securities Not Due at a Single Maturity Date - Mortgage-backed Securities	324,929
Fair/Book Value, Total	404,639	417,991
Amortized Cost [Abstract]
Within One Year	2,449
After One Year Through Five Years	18,866
After Five Years Through Ten Years	26,891
After Ten Years	20,254
Amortized cost, before single maturity date	68,460
Investment Securities Not Due at a Single Maturity Date - Mortgage-backed Securities	45
Amortized cost, Total	68,505	68,392
Fair Value [Abstract]
Within One Year	2,467
After One Year Through Five Years	19,286
After Five Years Through Ten Years	27,266
After Ten Years	19,626
Fair/Book Value, before single maturity date	68,645
Investment Securities Not Due at a Single Maturity Date - Mortgage-backed Securities	45
Fair Value	$ 68,690