Investment Securities The amortized cost and estimated fair value of securities (Details) $ in Thousands	12 Months Ended
Dec. 31, 2015 USD ($) purchase_agreement	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Available-for-sale:
Amortized Cost	$ 279,711	$ 200,758
Unrealized Gain	(1,953)	(1,667)
Unrealized Loss	(1,391)	(787)
Estimated Fair Value	280,273	201,638
Held-to-maturity:
Amortized Cost	9,642	0
Unrealized Gain	0
Unrealized Loss	(70)
Estimated Fair Value	9,572
Total securities
Amortized Cost	289,353
Unrealized Gain	1,953
Unrealized Loss	(1,461)
Estimated Fair Value	$ 289,845
Additional disclosures
Number of inverse putable reverse repurchase of the Bank's secured by collateral \| purchase_agreement	3
Value of inverse putable reverse repurchases secured by collateral	$ 28,500
OTTI losses	0	(29)	$ 4
Gross gains	317	2,100	2,000
Gross losses	(27)	(578)	(468)
Proceeds from sale or maturity of securities available for sale	27,642	166,341	$ 234,067
Mortgage-backed securities
Additional disclosures
Estimated par value of securities pledged as collateral for the Bank's inverse putable reverse repurchases	61,000
Fair value of securities pledged as collateral for the Bank's inverse putable reverse repurchases	62,500
Home Owners Association Loans
Additional disclosures
Value of inverse putable reverse repurchases secured by collateral	19,600
Municipal bonds
Available-for-sale:
Amortized Cost	128,546	88,599
Unrealized Gain	(1,796)	(1,235)
Unrealized Loss	(97)	(173)
Estimated Fair Value	130,245	89,661
Collateralized mortgage obligation
Available-for-sale:
Amortized Cost	24,722	6,831
Unrealized Gain	(4)	(31)
Unrealized Loss	(183)	0
Estimated Fair Value	24,543	6,862
Mortgage-backed securities
Available-for-sale:
Amortized Cost	126,443	105,328
Unrealized Gain	(153)	(401)
Unrealized Loss	(1,111)	(614)
Estimated Fair Value	125,485	$ 105,115
Held-to-maturity:
Amortized Cost	8,400
Unrealized Gain	0
Unrealized Loss	(70)
Estimated Fair Value	8,330
Other
Held-to-maturity:
Amortized Cost	1,242
Unrealized Gain	0
Unrealized Loss	0
Estimated Fair Value	$ 1,242

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