Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest income
Loans and fees on loans	$ 207,836,000	$ 147,310,000	$ 99,633,000
Investment securities, taxable	15,345,000	8,733,000	1,432,000
Other interest earning assets	4,799,000	6,600,000	2,407,000
Total interest income	227,980,000	162,643,000	103,472,000
Interest expense
Deposits	87,897,000	54,469,000	24,223,000
Borrowings	1,000	131,000	1,215,000
Total interest expense	87,898,000	54,600,000	25,438,000
Net interest income	140,082,000	108,043,000	78,034,000
Provision for loan and lease losses	19,573,000	13,058,000	9,536,000
Net interest income after provision for loan and lease losses	120,509,000	94,985,000	68,498,000
Noninterest income
Loan servicing revenue	28,034,000	29,121,000	24,588,000
Loan servicing asset revaluation	(4,812,000)	(18,765,000)	(13,171,000)
Net gains on sales of loans	29,002,000	75,170,000	78,590,000
Equity method investments income (loss)	(7,889,000)	(386,000)	(513,000)
Equity security investments gains (losses), net	3,532,000	213,000	89,000
Gain on sale of investment securities available-for-sale	620,000
Lease income	9,655,000	7,966,000	1,856,000
Gain on contribution to equity method investment			68,000,000
Construction supervision fee income	1,765,000	2,277,000	1,776,000
Title insurance income		2,775,000	7,565,000
Other noninterest income	7,973,000	5,394,000	4,141,000
Total noninterest income	67,880,000	103,765,000	172,921,000
Noninterest expense
Salaries and employee benefits	90,634,000	77,411,000	74,669,000
Travel expense	6,921,000	9,156,000	8,124,000
Professional services expense	6,859,000	4,878,000	4,937,000
Advertising and marketing expense	5,936,000	6,015,000	6,363,000
Occupancy expense	8,116,000	7,065,000	6,195,000
Data processing expense	9,265,000	12,010,000	8,449,000
Equipment expense	16,327,000	13,724,000	7,479,000
Other loan origination and maintenance expense	9,272,000	5,967,000	4,970,000
Renewable energy tax credit investment impairment	602,000		690,000
FDIC insurance	3,447,000	3,234,000	3,206,000
Title insurance closing services expense		912,000	2,418,000
Impairment expense on goodwill and other intangibles	0	2,680,000	3,648,000
Other expense	7,545,000	9,652,000	12,017,000
Total noninterest expense	164,924,000	152,704,000	143,165,000
Income before taxes	23,465,000	46,046,000	98,254,000
Income tax expense (benefit)	5,431,000	(5,402,000)	(2,245,000)
Net income	$ 18,034,000	$ 51,448,000	$ 100,499,000
Basic earnings per share	$ 0.45	$ 1.28	$ 2.75
Diluted earnings per share	$ 0.44	$ 1.24	$ 2.65