PCI Loans and Related Allowance for Loan Losses (Summary of Covered Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount Net	$ 32,528	$ 38,285
Purchase Credit Impaired (PCI) Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount Net	$ 32,528	$ 38,285
Percent of purchased credit impaired loan	100.00%	100.00%
Purchase Credit Impaired (PCI) Loans [Member] | Mortgage Loans on Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount Net	$ 32,528	$ 38,285
Percent of purchased credit impaired loan	100.00%	100.00%
Purchase Credit Impaired (PCI) Loans [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount Net	$ 29,465	$ 34,240
Percent of purchased credit impaired loan	90.58%	89.43%
Purchase Credit Impaired (PCI) Loans [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount Net	$ 490	$ 746
Percent of purchased credit impaired loan	1.51%	1.95%
Purchase Credit Impaired (PCI) Loans [Member] | Construction and Land Development [Member] | Mortgage Loans on Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount Net	$ 1,172	$ 1,326
Percent of purchased credit impaired loan	3.60%	3.46%
Purchase Credit Impaired (PCI) Loans [Member] | Second Mortgages [Member] | Mortgage Loans on Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount Net	$ 1,169	$ 1,729
Percent of purchased credit impaired loan	3.59%	4.52%
Purchase Credit Impaired (PCI) Loans [Member] | Multifamily [Member] | Mortgage Loans on Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount Net	$ 232	$ 244
Percent of purchased credit impaired loan	0.72%	0.64%