Investment Securities Schedule of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Due within 1 year	$ 0
Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value	0
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	851
Held-to-maturity Securities	154,035
Securities held to maturity, fair value	154,837	$ 0
Due after 1 but within 5 years	0
Due after 5 but within 10 years	12,210
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	12,303
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value	0
Due after 10 years	5,655
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	5,650
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	17,865
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value	17,953
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount	136,170
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value	136,884
US Government Agencies Residential Mortgage-backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	24
Held-to-maturity Securities	4,806
Securities held to maturity, fair value	4,830
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities	131,364
Securities held to maturity, fair value	$ 132,054