Loans, Changes in the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in the Allowance for Unfunded Commitments
Balance at beginning of period	$ 24,000
Balance at end of period	22,000	$ 24,000
Allowance for Unfunded Commitments
Change in the Allowance for Unfunded Commitments
Balance at beginning of period	24,336	24,400	$ 25,400
Provision for unfunded commitments	(2,500)	(2,500)	(1,000)
Balance at end of period	21,907	24,336	24,400
Amount Recorded at Acquisition [Member] | Allowance for Unfunded Commitments
Change in the Allowance for Unfunded Commitments
Amount recorded at acquisition	$ 70	$ 2,436	$ 0