Loan and Lease Receivables - Schedule of Outstanding Loan and Lease Receivables (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	$ 3,826,735		$ 3,499,463
Net unamortized deferred fees and costs	1,444		(1,293)
Initial direct costs	2,911		3,456
Allowance for loan and lease losses	(31,585)	$ (31,132)	(25,201)	$ (23,424)	$ (19,687)	$ (16,706)
Net loans and leases	3,799,505		3,476,425
Lease financing receivables
Net minimum lease payments	196,163		204,646
Unguaranteed residual values	1,379		1,535
Unearned income	(17,269)		(18,384)
Total lease financing receivables	180,273		187,797
Initial direct costs	2,911		3,456
Lease financial receivables before allowance for lease losses	183,184		191,253
Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	1,305,438		1,261,594
Allowance for loan and lease losses	(8,553)	(8,934)	(7,540)	(7,422)	(6,453)	(4,794)
Residential Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	748,875		704,899
Allowance for loan and lease losses	(2,251)	(2,171)	(1,751)	(1,677)	(1,648)	(1,638)
Construction, Land Development, and Other Land
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	281,868		186,258
Allowance for loan and lease losses	(816)	(691)	(466)	(390)	(332)	(222)
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	1,300,997		1,145,240
Allowance for loan and lease losses	(17,783)	(17,126)	(12,932)	(11,165)	(8,369)	(7,418)
Installment and Other
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	9,284		13,675
Allowance for loan and lease losses	(55)	(67)	(49)	(38)	(30)	(41)
Lease Financing Receivables
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	180,273		187,797
Allowance for loan and lease losses	$ (2,127)	$ (2,143)	$ (2,463)	$ (2,732)	$ (2,855)	$ (2,593)