Loan and Lease Receivables - Schedule of Unpaid Principal Balance and Carrying Value for Acquired Non-impaired Loans and Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Accounts Notes And Loans Receivable [Line Items]
Loans and leases	$ 4,454,620	$ 4,340,535	$ 3,860,259
Acquired Non-impaired Loans and Leases
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	434,163	481,612
Loans and leases	423,764	470,258
Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Loans and leases	1,431,668	1,421,670	1,294,959
Commercial Real Estate | Acquired Non-impaired Loans and Leases
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	277,282	302,091
Loans and leases	271,458	295,599
Residential Real Estate
Accounts Notes And Loans Receivable [Line Items]
Loans and leases	545,279	572,271	693,997
Residential Real Estate | Acquired Non-impaired Loans and Leases
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	71,838	80,104
Loans and leases	71,038	79,211
Construction, Land Development, and Other Land
Accounts Notes And Loans Receivable [Line Items]
Loans and leases	240,324	230,733	277,776
Construction, Land Development, and Other Land | Acquired Non-impaired Loans and Leases
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	276	278
Loans and leases	210	212
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Loans and leases	1,364,396	1,368,900	1,414,559
Commercial and Industrial | Acquired Non-impaired Loans and Leases
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	72,122	84,608
Loans and leases	69,795	82,195
Installment and Other
Accounts Notes And Loans Receivable [Line Items]
Loans and leases	1,616	2,005	5,721
Installment and Other | Acquired Non-impaired Loans and Leases
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	344	553
Loans and leases	331	536
Lease Financing Receivables
Accounts Notes And Loans Receivable [Line Items]
Loans and leases	254,331	227,141	$ 173,247
Lease Financing Receivables | Acquired Non-impaired Loans and Leases
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	12,301	13,978
Loans and leases	$ 10,932	$ 12,505