Business Combinations, Assets Acquired and Liabilities Assumed (Details) - Bank of Rio Vista [Member] - USD ($) $ in Thousands	Oct. 10, 2018	Dec. 31, 2018
Assets Acquired [Abstract]
Loans		$ 80,500
Goodwill	$ 11,183
Deposits [Abstract]
Cash Paid	28,642
Value of Previously Held Equity Interest	13,005
Total Merger Consideration	41,647
Book Value [Member]
Assets Acquired [Abstract]
Cash and Cash Equivalents	22,655
Investments	104,118
Loans	78,437
Core Deposit Intangible	0
Goodwill	0
Deferred Tax	2,813
Other Assets	9,470
Total Assets Acquired	217,493
Deposits [Abstract]
Demand	54,450
Interest-Bearing Transaction	48,469
Savings and Money Market	62,839
Time	25,813
Total Deposits	191,571
Other liabilities	1,238
Total liabilities assumed	192,809
Fair Value [Member]
Assets Acquired [Abstract]
Cash and Cash Equivalents	22,655
Investments	104,118
Loans	80,494
Core Deposit Intangible	4,670
Goodwill	11,183
Deferred Tax	298
Other Assets	11,038
Total Assets Acquired	234,456
Deposits [Abstract]
Demand	54,450
Interest-Bearing Transaction	48,469
Savings and Money Market	62,839
Time	25,813
Total Deposits	191,571
Other liabilities	1,238
Total liabilities assumed	$ 192,809