Loans - Fixed and Floating Rate Loans by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing receivables, fixed and floating rate loans by contractual maturity [Abstract]
One year or less	$ 252,552	$ 310,455
More than one to five years	1,043,454	795,586
More than five to 15 years	242,259	213,215
Over 15 years	230,579	195,307
Subtotal	1,768,844	1,514,563
Nonaccrual loans	25,290	14,403
Total Loans before Unearned Income	1,794,134	1,528,966
Unearned income	(5,418)	(3,476)
Total loans net of unearned income	1,788,716	1,525,490
Fixed Rate Loans
Financing receivables, fixed and floating rate loans by contractual maturity [Abstract]
One year or less	178,559	205,596
More than one to five years	677,486	509,455
More than five to 15 years	157,746	147,502
Over 15 years	144,770	143,695
Subtotal	1,158,561	1,006,248
Floating Rate Loans
Financing receivables, fixed and floating rate loans by contractual maturity [Abstract]
One year or less	73,993	104,859
More than one to five years	365,968	286,131
More than five to 15 years	84,513	65,713
Over 15 years	85,809	51,612
Subtotal	610,283	508,315
Loans at interest rate floor	$ 275,800	$ 153,300