Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Held for Investment, Amortized Cost, Total	$ 203,525	$ 207,904
Held for Investment, Fair Value, Total	202,813	208,787
Available for Sale, Amortized Cost, Total	798,575
Available for Sale, Fair Value, Total	790,766	741,375
Collateralized Loan Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held for Investment, Amortized Cost, Due in less than one year	0
Held for Investment, Fair Value, Due in less than one year	0
Available for Sale Amortized Cost, Due in less than one year	225
Available for Sale, Fair Value, Due in less than one year	225
Held for Investment, Amortized Cost, Due after one year through five years	0
Held for Investment, Fair Value, Due after one year through five years	0
Available for Sale, Amortized Cost, Due after one year through five years	71,031
Available for Sale, Fair Value, Due after one year through five years	70,387
Held for Investment, Amortized Cost, Due after five years through ten years	41,300
Held for Investment, Fair Value, Due after five years through ten years	39,940
Available for Sale, Amortized Cost, Due after five years through ten years	118,429
Available for Sale, Fair Value, Due after five years through ten years	117,480
Held for Investment, Amortized Cost, Due after ten years	0
Held for Investment, Fair Value, Due after ten years	0
Available for Sale, Amortized Cost, Due after ten years	13,632
Available for Sale, Fair Value, Due after ten years	13,826
Held for Investment, Amortized Cost, Total	41,300
Held for Investment, Fair Value, Total	39,940
Available for Sale, Amortized Cost, Total	203,317
Available for Sale, Fair Value, Total	201,918
Mortgage-backed Securities, US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held for Investment, Amortized Cost, Total	64,993
Held for Investment, Fair Value, Total	65,551	68,347
Available for Sale, Amortized Cost, Total	192,224
Available for Sale, Fair Value, Total	191,749	125,059
Collateralized Mortgage Obligations Of US Government Sponsored Entities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held for Investment, Amortized Cost, Total	89,265
Held for Investment, Fair Value, Total	89,440	114,956
Available for Sale, Amortized Cost, Total	242,620
Available for Sale, Fair Value, Total	238,190	347,481
Private mortgage backed securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held for Investment, Amortized Cost, Total	0
Held for Investment, Fair Value, Total	0
Available for Sale, Amortized Cost, Total	32,558
Available for Sale, Fair Value, Total	31,792	30,258
Private collateralized mortgage obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held for Investment, Amortized Cost, Total	7,967
Held for Investment, Fair Value, Total	7,882
Available for Sale, Amortized Cost, Total	77,965
Available for Sale, Fair Value, Total	77,957	$ 85,135
Corporate and other debt securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held for Investment, Amortized Cost, Total	0
Held for Investment, Fair Value, Total	0
Available for Sale, Amortized Cost, Total	8,764
Available for Sale, Fair Value, Total	44,273
Private commercial mortgage backed securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held for Investment, Amortized Cost, Total	0
Held for Investment, Fair Value, Total	0
Available for Sale, Amortized Cost, Total	41,127
Available for Sale, Fair Value, Total	$ 40,420