Investment Securities - Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Total securities
Amortized Cost	$ 276,818	$ 289,353
Unrealized Gain	3,017	1,953
Unrealized Loss	(512)	(1,461)
Estimated Fair Value	279,323	289,845
Available for sale:
Total	267,228	279,711	$ 278,278
Unrealized Gain	2,995	1,953	2,815
Unrealized Loss	(512)	(1,391)	(632)
Investment securities available for sale, at fair value	269,711	280,273	280,461
Held to maturity:
Amortized Cost	9,590	9,642	0
Unrealized Gain	22	0
Unrealized Loss	0	(70)
Estimated Fair Value	9,612	9,572
Municipal bonds
Available for sale:
Total	123,484	128,546	103,997
Unrealized Gain	2,426	1,796	1,718
Unrealized Loss	(28)	(97)	(192)
Investment securities available for sale, at fair value	125,882	130,245	105,523
Collateralized mortgage obligation
Available for sale:
Total	23,805	24,722	11,204
Unrealized Gain	70	4	84
Unrealized Loss	(9)	(183)	0
Investment securities available for sale, at fair value	23,866	24,543	11,288
Mortgage-backed securities
Available for sale:
Total	119,939	126,443	163,077
Unrealized Gain	499	153	1,013
Unrealized Loss	(475)	(1,111)	(440)
Investment securities available for sale, at fair value	119,963	125,485	$ 163,650
Held to maturity:
Amortized Cost	8,361	8,400
Unrealized Gain	22	0
Unrealized Loss	0	(70)
Estimated Fair Value	8,383	8,330
Other
Held to maturity:
Amortized Cost	1,229	1,242
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	$ 1,229	$ 1,242

Available-For-Sale And Held-To-Maturity Securities [Abstract]

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Available-for-sale Securities And Held-To-Maturity Securities, Accumulated Gross Unrealized Gain, before Tax

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Available-for-sale Securities And Held-To-Maturity Securities, Accumulated Gross Unrealized Loss, before Tax

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity.

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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity in a continuous loss position.

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Fair value of investments in debt securities classified as held-to-maturity.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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