Fair Value (Fair Value Measurement of Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Carrying Value
Financial assets:
Cash and cash equivalents	$ 364,112	$ 103,930
Federal Home Loan Bank stock	12,398	11,475
Net loans	1,798,290	1,214,935
Accrued interest receivable	8,893	4,403
Financial liabilities:
Deposits	1,821,351	1,135,428
Borrowings	455,159	212,225
Subordinated notes	44,457	44,440
Accrued interest payable	1,718	1,574
Estimate of Fair Value Measurement
Financial assets:
Cash and cash equivalents	364,112	103,930
Net loans	1,844,461	1,203,639
Accrued interest receivable	8,893	4,403
Financial liabilities:
Deposits	1,878,937	1,138,202
Borrowings	462,998	212,125
Subordinated notes	43,125	47,100
Accrued interest payable	1,718	1,574
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	28,378	19,990
Net loans	0	0
Accrued interest receivable	0	0
Financial liabilities:
Deposits	0	0
Borrowings	0	0
Subordinated notes	0	0
Accrued interest payable	0	0
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2)
Financial assets:
Cash and cash equivalents	335,734	83,940
Net loans	0	0
Accrued interest receivable	1,353	1,236
Financial liabilities:
Deposits	1,878,937	1,138,202
Borrowings	462,998	212,125
Subordinated notes	43,125	47,100
Accrued interest payable	1,718	1,574
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	0	0
Net loans	1,844,461	1,203,639
Accrued interest receivable	7,540	3,167
Financial liabilities:
Deposits	0	0
Borrowings	0	0
Subordinated notes	0	0
Accrued interest payable	$ 0	$ 0