Allowance for Credit Losses - Bank's Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	$ 20,800	$ 19,000
Provision for Credit Losses	2,279	540
Charge-offs	(530)	(548)
Recoveries	451	208
Ending Balance	23,000	19,200
Residential Properties
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	8,423	9,216
Provision for Credit Losses	(2,034)	422
Ending Balance	6,389	9,638
Commercial Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	4,166	4,547
Provision for Credit Losses	772	(232)
Ending Balance	4,938	4,315
Commercial and Industrial Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	7,448	4,628
Provision for Credit Losses	2,756	503
Charge-offs	(530)	(543)
Recoveries	451	207
Ending Balance	10,125	4,795
Consumer Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	190	218
Provision for Credit Losses	14	(4)
Charge-offs		(5)
Recoveries		1
Ending Balance	204	210
Land
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	573	391
Provision for Credit Losses	771	(149)
Ending Balance	$ 1,344	$ 242