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Income Taxes (Deferred Tax Assets and Deferred Tax Liabilities) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:      
Loans receivable, principally due to the allowance for probable loan losses $ 12,050,000 $ 12,257,000  
Other real estate owned 2,501,000 2,459,000  
Impairment charges on available-for-sale securities 1,054,000 1,054,000  
Accrued expenses 98,000 81,000  
Net unrealized losses on available for sale investment securities   15,182,000  
Other 6,019,000 5,076,000  
Total deferred tax assets 21,722,000 36,109,000  
Deferred tax liabilities:      
Bank premises and equipment, principally due to differences on depreciation (12,478,000) (12,596,000)  
Net unrealized gains on available for sale investment securities (508,000)    
Identified intangible assets and goodwill (13,649,000) (13,490,000)  
Other (18,849,000) (14,787,000)  
Total deferred tax liabilities 45,484,000 40,873,000  
Net deferred tax liability $ (23,762,000) $ (4,764,000)  
U.S. Federal income tax rate (as a percent) 21.00% 21.00% 35.00%
Net benefit due to change in tax rate $ 4,786,000