Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Common Stock [Member]
Net income
Cash dividend declared on common shares and payable after period-end	401,000	$ 400,000
Preferred Stock [Member]
Net income
Cash dividend declared on common shares and payable after period-end		50,000
Net income	2,962,000	6,716,000
Provision for depreciation and amortization	1,397,000	1,126,000
Amortization of core deposit intangibles	130,000
Amortization of debt issuance costs	30,000
Compensation expense associated with stock options	18,000	33,000
Compensation expense associated with restricted stock	163,000	68,000
Net gain on sale or call of securities	(192,000)	(413,000)
Other than temporary impairment on investment securities	546,000
Amortization of investment premiums and accretion of discounts, net	1,256,000	1,424,000
Amortization of held-to-maturity fair value adjustments	(79,000)	(116,000)
Loss on cancellation of interest rate swap	2,325,000
Loss (gain) on disposal of fixed assets	2,000	(4,000)
Write-down of fixed assets		238,000
Write-down of other real estate owned	76,000
Loss on sale of other real estate owned	119,000	4,000
Decrease in deferred income taxes	363,000
Increase in cash surrender value of life insurance	(461,000)	(482,000)
(Decrease) increase in deferred compensation and salary continuation plans	(26,000)	28,000
Increase in deferred loan fees and costs	(285,000)	(561,000)
(Increase) decrease in other assets	(796,000)	669,000
Decrease in other liabilities	(1,059,000)	(1,165,000)
Net cash provided by operating activities	6,489,000	7,565,000
Proceeds from maturities of and payments on available-for-sale securities	25,660,000	18,328,000
Proceeds from sales of securities	46,699,000	61,255,000
Purchases of available-for-sale securities	(70,892,000)	(52,015,000)
Proceeds from maturities of and payments on held-to-maturity securities	4,310,000	849,000
Investment in qualified affordable housing partnerships	(688,000)	(863,000)
Net redemption of Federal Home Loan Bank of San Francisco stock		1,263,000
Loan originations, net of principal repayments	(74,008,000)	(51,452,000)
Net repayment on (purchase of) loan pools	12,316,000	(9,833,000)
Purchase of premises and equipment	(2,067,000)	(347,000)
Proceeds from the sale of other real estate owned	545,000	2,864,000
Payments to derivative counterparties for the termination of interest rate swaps	(2,578,000)
Acquisition of branches, net of cash paid	142,411,000
Net cash provided (used) by investing activities	81,708,000	(29,951,000)
Net increase in demand deposits and savings accounts	54,607,000	6,727,000
Net decrease in certificates of deposit	(31,896,000)	(16,257,000)
Advances on term debt	55,000,000	240,000,000
Repayment of term debt	(130,772,000)	(240,000,000)
Proceeds from stock options exercised	4,000	152,000
Cash dividends paid on preferred stock		(150,000)
Cash dividends paid on common stock	(1,202,000)	(1,199,000)
Net cash used in financing activities	(54,259,000)	(10,727,000)
Net increase (decrease) in cash and cash equivalents	33,938,000	(33,113,000)
Cash and cash equivalents at beginning of year	51,192,000	58,422,000
Cash and cash equivalents at end of period	85,130,000	25,309,000
Income taxes	3,444,000	3,650,000
Interest	3,884,000	3,486,000
Transfer of loans to other real estate owned	110,000	3,721,000
Transfer of fixed asset to other real estate owned		170,000
Changes in unrealized gain (loss) on investment securities available-for-sale	669,000	(957,000)
Changes in net deferred tax asset related to changes in unrealized gain (loss) on investment securities available-for-sale	(276,000)	394,000
Changes in accumulated other comprehensive income due to changes in unrealized gain on investment securities available-for-sale	393,000	(563,000)
Accretion of held-to-maturity investment securities from other comprehensive income to interest income	(79,000)	(116,000)
Changes in deferred tax related to accretion of held-to-maturity investment securities	33,000	47,000
Changes in accumulated other comprehensive income due to accretion of held-to-maturity investment securities	(46,000)	(69,000)
Changes in unrealized loss on derivatives	(348,000)	(917,000)
Changes in net deferred tax asset related to changes in unrealized loss on derivatives	143,000	377,000
Changes in accumulated other comprehensive income due to changes in unrealized loss on derivatives	(205,000)	(540,000)
Interest rate swaps	2,721,000	1,005,000
Changes in net deferred tax asset related to reclassification of losses on derivatives	(1,120,000)	(414,000)
Changes in accumulated other comprehensive income due to reclassification of losses on derivatives	1,601,000	591,000
Vested restricted stock issued under employee plans	84,000	36,000
Transactions Related to Acquisition:
Assets acquired - fair value	155,230,000
Goodwill	665,000
Liabilities assumed - fair value	$ 149,239,000