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Loans and Allowance for Loan Losses (Acquired Purchased Credit Impaired Loans) (Details) - Purchased Credit Impaired Loans [Member]
$ in Thousands
Dec. 31, 2018
USD ($)
Tennessee Bancshares [Member]  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]  
Contractual principal and interest at acquisition $ 15,133
Nonaccretable difference 5,302
Expected cash flows at acquisition 9,831
Accretable yield 1,292
Basis in PCI loans at acquisition-estimated fair value 8,539
Foothills Bancorp [Member]  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]  
Contractual principal and interest at acquisition 12,125
Nonaccretable difference 2,748
Expected cash flows at acquisition 9,377
Accretable yield 1,124
Basis in PCI loans at acquisition-estimated fair value $ 8,253