Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses, Purchased Credit Impaired Loans (Details) - Financial Asset Acquired with Credit Deterioration - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loans and Allowance for Loan Losses - Purchase Credit Impaired [Line Items]
Purchased Loans Contractually Required Principal And Interest	$ 4,420,000	$ 0	$ 94,312,000
Purchased Loans Cash Flows Expected To Be Collected	1,883,000	0	48,498,000
Purchased Credit Impaired Loans Acquisition Date Fair Value	$ 1,883,000	$ 0	$ 48,302,000