Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 8,586	$ 5,727	$ 7,935
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan and lease losses		3,175	2,750
Provision for unfunded commitments			200
Provision for depreciation and amortization	1,524	1,320	993
Compensation expense associated with stock options	42	54	24
Compensation expense associated with restricted stock	89	6	6
Net (gain) loss on sale of securities available-for-sale	(443)	159	(995)
Amortization of investment premiums and accretion of discounts, net	1,876	1,662	1,153
Amortization of held-to-maturity fair value adjustments	(144)	(155)	(155)
(Gain) loss on sale of fixed assets	(4)	7	6
Write-down of fixed assets	238
Write-down of other real estate owned		290
Loss on sale of other real estate owned	26	8	130
Increase in cash surrender value of life insurance	(641)	(628)	(709)
Increase (decrease) in deferred compensation and salary continuation plans	28	1,388	(115)
(Increase) decrease in deferred loan fees and costs	(713)	146	9
(Gain) on repayment of junior subordinated debentures		(406)
Increase (decrease) in deferred income taxes	584	(191)	(1,130)
Decrease (increase) in other assets	507	(946)	(5,145)
(Decrease) increase in other liabilities	(1,255)	2,398	4,971
Net cash provided by operating activities	10,300	14,014	9,928
Cash flows from investing activities:
Proceeds from maturities and payments of available-for-sale securities	23,426	20,248	12,059
Proceeds from sale of available-for-sale securities	71,277	93,545	103,303
Purchases of available-for-sale securities	(69,362)	(79,852)	(141,573)
Proceeds from maturities and payments of held-to-maturity securities	1,099	311	57
Purchases of held-to-maturity securities		(244)	(5,151)
Investment in qualified affordable housing partnerships	(1,133)	(2,371)
Net redemption (purchase) of Federal Home Loan Bank of San Francisco stock	1,263	(1,198)
Loan (originations), net of principal repayments	(46,554)	(21,344)	64,790
Purchase of loan pools	(43,749)	(60,670)
Repayments on loan pools	31,034	11,895
Purchase of life insurance		(5,000)
Purchase of premises and equipment	(705)	(2,729)	(2,156)
Proceeds from the sale of other real estate owned	3,111	802	3,603
Proceeds from settlement of note to former mortgage subsidiary	686	686
Payments to derivative counterparties for the termination of interest rate swaps			(503)
Net cash (used in) provided by investing activities	(30,293)	(45,921)	34,429
Cash flows from financing activities:
Net increase in demand deposits and savings accounts	35,382	46,470	51,386
Net decrease in certificates of deposit	(20,682)	(3,728)	(6,145)
Net decrease in securities sold under agreements to repurchase			(13,095)
Advances on term debt	260,000	250,000	900,000
Repayment of term debt	(240,083)	(250,000)	(950,000)
Repayment of junior subordinated debentures		(4,629)
Debt issuance costs paid net of amortization	(223)
Proceeds from stock options exercised	156	23	17
Stock issued under employee and director stock purchase plan	36	66
Repurchase of common stock		(4,562)	(10,614)
Redemption of preferred stock	(20,000)
Preferred stock extinguishment costs	(33)
Cash dividends paid on preferred stock	(189)	(200)	(347)
Cash dividends paid on common stock	(1,601)	(1,626)	(2,112)
Net cash provided by (used in) financing activities	12,763	31,814	(30,910)
Net (decrease) increase cash and cash equivalents	(7,230)	(93)	13,447
Cash and cash equivalents at the beginning of year	58,422	58,515	45,068
Cash and cash equivalents at the end of year	51,192	58,422	58,515
Interest	4,628	4,192	4,123
Supplemental disclosures of non cash investing activities:
Transfer of loans to other real estate owned	3,888	689	1,585
Transfer of fixed asset to other real estate owned	170
Changes in unrealized gain on investment securities available-for-sale	(985)	6,307	(6,648)
Changes in net deferred tax asset related to changes in unrealized gain on investment securities available-for-sale	402	(2,596)	2,739
Changes in accumulated other comprehensive income due to changes in unrealized gain on investment securities available-for-sale	(583)	3,711	(3,909)
Accretion of held-to-maturity from other comprehensive income to interest income	(144)	(155)	(155)
Changes in deferred tax related to accretion of held-to-maturity investment securities	59	64	64
Changes in accumulated other comprehensive income due to accretion of held-to-maturity investment securities	(85)	(91)	(91)
Changes in unrealized (gain) loss on derivatives	(584)	(333)	691
Changes in net deferred tax asset related to changes in unrealized loss on derivatives	242	136	(284)
Changes in accumulated other comprehensive income due to changes in unrealized gain (loss) on derivatives	(342)	(197)	407
Reclassification of earnings from loss (gain) on derivatives	1,435	(1,900)	(304)
Changes in net deferred tax asset related to reclassification of earnings from gains on derivatives	(592)	782	247
Changes in accumulated other comprehensive income due to reclassification of earnings from gain on derivatives	843	(1,118)	(57)
Supplemental disclosures of non cash financing activities:
Preferred stock accretion	69
Dividend payable	400	449
Cash paid during the period for:
Income taxes	4,123	419	7,859
Common Stock [Member]
Supplemental disclosures of non cash financing activities:
Dividend payable	400	399	419
Preferred Stock [Member]
Supplemental disclosures of non cash financing activities:
Preferred stock accretion	$ 69
Dividend payable		$ 50	$ 50