Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest Income
Loans	$ 186,428,000	$ 119,457,000	$ 79,922,000
Investment securities:
Trading	6,690,000	5,012,000	5,187,000
Available for sale - taxable	6,208,000	6,448,000	4,531,000
Available for sale - tax exempt	272,000
Federal Home Loan Bank stock	932,000	385,000	321,000
Other	11,465,000	9,261,000	4,426,000
Total interest income	211,995,000	140,563,000	94,387,000
Interest Expense
Deposits	84,661,000	42,216,000	20,003,000
Borrowed funds	5,036,000	8,376,000	7,787,000
Total interest expense	89,697,000	50,592,000	27,790,000
Net interest income	122,298,000	89,971,000	66,597,000
Provision for loan losses	3,940,000	4,629,000	2,472,000
Net Interest Income After Provision for Loan Losses	118,358,000	85,342,000	64,125,000
Noninterest Income
Gain on sale of loans	35,411,000	39,266,000	37,790,000
Loan servicing fees, net	(1,118,000)	5,741,000	6,273,000
Mortgage warehouse fees	7,145,000	2,550,000	2,608,000
Gains/(losses) on sale of investments available for sale (includes $476, $0, and $0, respectively, related to accumulated other comprehensive earnings reclassifications)	476,000	0
Other income	5,175,000	2,028,000	1,009,000
Total noninterest income	47,089,000	49,585,000	47,680,000
Noninterest Expense
Salaries and employee benefits	38,093,000	32,240,000	21,472,000
Loan expenses	4,534,000	4,621,000	4,097,000
Occupancy and equipment	4,609,000	2,788,000	1,602,000
Professional fees	2,326,000	2,585,000	1,516,000
Deposit insurance expense	2,747,000	1,024,000	930,000
Technology expense	2,623,000	1,544,000	1,171,000
Other expense	8,381,000	6,098,000	3,856,000
Total noninterest expense	63,313,000	50,900,000	34,644,000
Income Before Income Taxes	102,134,000	84,027,000	77,161,000
Provision for income taxes (includes $(117), $0, and $0, respectively, related to income tax (expense)/benefit for reclassification items)	24,805,000	21,153,000	22,477,000
Net Income	77,329,000	62,874,000	54,684,000
Dividends on preferred stock	(9,216,000)	(3,330,000)	(3,330,000)
Net Income Allocated to Common Shareholders	$ 68,113,000	$ 59,544,000	$ 51,354,000
Basic Earnings Per Share (in dollar per share)	$ 2.37	$ 2.08	$ 2.28
Diluted Earnings Per Share (in dollar per share)	$ 2.37	$ 2.07	$ 2.28
Weighted-Average Shares Outstanding Basic (in Shares)	28,705,125	28,692,955	22,551,452
Weighted-Average Shares Outstanding Diluted (in Shares)	28,745,707	28,724,419	22,568,154