Mortgage Banking Activities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Mortgage Banking [Abstract]
Loans originated for sale	$ 627,597,000	$ 364,630,000	$ 412,925,000
Proceeds from sale of loans originated for sale	601,215,000	376,535,000	425,262,000
Proceeds from sale of loans held-for-investment	100,500,000	0	42,300,000
Gain on loans sold	10,275,000	6,102,000	7,775,000
Gain resulting from the change in fair value of loans held-for-sale	538,000	57,000	638,000
Gain (loss) resulting from the change in fair value of derivatives	728,000	(441,000)	(577,000)
Net revenue from mortgage banking activities	$ 11,541,000	$ 5,718,000	$ 7,836,000