Parent Company Financial Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Balance Sheets [Abstract]
Investment Securities	$ 430,405us-gaap_MarketableSecurities	$ 473,144us-gaap_MarketableSecurities
Other Assets	96,367us-gaap_OtherAssets	90,294us-gaap_OtherAssets
Total Assets	2,360,551us-gaap_Assets	2,076,073us-gaap_Assets
Subordinated Debentures	10,310us-gaap_SubordinatedDebt	10,310us-gaap_SubordinatedDebt
Liabilities	2,127,373us-gaap_Liabilities	1,866,169us-gaap_Liabilities
Shareholders' Equity	233,178us-gaap_StockholdersEquity	209,904us-gaap_StockholdersEquity	205,033us-gaap_StockholdersEquity	189,346us-gaap_StockholdersEquity
Total Liabilities and Shareholders' Equity	2,360,551	2,076,073
Condensed Statements of Income [Abstract]
Interest Income	78,708us-gaap_InterestIncomeExpenseNet	73,640us-gaap_InterestIncomeExpenseNet	73,351us-gaap_InterestIncomeExpenseNet
Tax Benefit	(15,094)us-gaap_IncomeTaxExpenseBenefit	(14,221)us-gaap_IncomeTaxExpenseBenefit	(13,985)us-gaap_IncomeTaxExpenseBenefit
Net Income	25,402us-gaap_NetIncomeLoss	24,061us-gaap_NetIncomeLoss	23,349us-gaap_NetIncomeLoss
Cash Flows from Operating Activities [Abstract]
Net Income	25,402us-gaap_NetIncomeLoss	24,061us-gaap_NetIncomeLoss	23,349us-gaap_NetIncomeLoss
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities [Abstract]
Net Decrease (Increase) in Other Assets	15,070	3,719	434
Net Cash Provided by Operating Activities	25,637	27,199	31,723
Investing Activities [Abstract]
Securities Purchased	(132,619)	(221,745)	(143,295)
Securities Sold or Matured	177,324	208,962	205,374
Net Cash Used by Investing Activities	(278,652)	(148,890)	(29,262)
Financing Activities [Abstract]
Stock Repurchases	0	0	(576)
Cash Dividends	(9,919)us-gaap_PaymentsOfDividendsCommonStock	(9,723)us-gaap_PaymentsOfDividendsCommonStock	(9,418)us-gaap_PaymentsOfDividendsCommonStock
Net Cash Provided by Financing Activities	246,463	75,942	25,305
(Decrease) Increase in Cash and Cash Equivalents	(6,552)	(45,749)	27,766
Parent Company [Member]
Condensed Balance Sheets [Abstract]
Cash	363	416	212
Investment in Farmers & Merchants Bank of Central California	242,852	219,640
Investment Securities	410	410
Other Assets	201	87
Total Assets	243,826	220,553
Subordinated Debentures	10,310	10,310
Liabilities	338	339
Shareholders' Equity	233,178	209,904
Total Liabilities and Shareholders' Equity	243,826	220,553
Condensed Statements of Income [Abstract]
Equity in Undistributed Earnings in Farmers & Merchants Bank of Central California	18,211	14,352	13,247
Dividends from Subsidiary	8,000	10,450	10,900
Interest Income	10	10	10
Other Expenses, Net	(1,406)	(1,288)	(1,386)
Tax Benefit	587	537	578
Net Income	25,402	24,061	23,349
Cash Flows from Operating Activities [Abstract]
Net Income	25,402	24,061	23,349
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities [Abstract]
Equity in Undistributed Net Earnings from Subsidiary	(18,211)	(14,352)	(13,247)
Net Decrease (Increase) in Other Assets	(114)	38	(216)
Net (Decrease) Increase in Liabilities	(1)	180	(78)
Net Cash Provided by Operating Activities	7,076	9,927	9,808
Investing Activities [Abstract]
Securities Purchased	0	0	0
Securities Sold or Matured	0	0	0
Net Cash Used by Investing Activities	0	0	0
Financing Activities [Abstract]
Stock Repurchases	0	0	(576)
Issuance of Common Stock	2,790	0	0
Cash Dividends	(9,919)	(9,723)	(9,418)
Net Cash Provided by Financing Activities	(7,129)	(9,723)	(9,994)
(Decrease) Increase in Cash and Cash Equivalents	(53)	204	(186)
Cash and Cash Equivalents at Beginning of Year	416	212	398
Cash and Cash Equivalents at End of Year	$ 363	$ 416	$ 212

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