Loans, Changes in the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
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
Provision for unfunded commitments	(2,500)	(2,500)
Amount recorded at acquisition	70	2,436
Balance at end of period	$ 21,907	$ 24,336