Allowance for Loan and Lease Losses - Recorded Investment in Loans and Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	$ 10,094
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	724
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	$ 7,765
Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment		$ 19,385
Collectively evaluated for impairment		4,681,661
Total		4,701,046
Originated | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment		2,110
Collectively evaluated for impairment		966,875
Total		968,985
Originated | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment		13,496
Collectively evaluated for impairment		2,283,152
Total		2,296,648
Originated | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment		3,779
Collectively evaluated for impairment		1,340,687
Total		1,344,466
Originated | Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment		0
Collectively evaluated for impairment		73,625
Total		73,625
Originated | Finance Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment		0
Collectively evaluated for impairment		17,322
Total		17,322
Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment		2,830
Loans acquired with deteriorated credit quality		9,149
Collectively evaluated for impairment		208,170
Total		220,149
Acquired | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment		2
Loans acquired with deteriorated credit quality		173
Collectively evaluated for impairment		38,901
Total		39,076
Acquired | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment		714
Loans acquired with deteriorated credit quality		5,674
Collectively evaluated for impairment		140,529
Total		146,917
Acquired | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment		2,114
Loans acquired with deteriorated credit quality		3,302
Collectively evaluated for impairment		27,955
Total		33,371
Acquired | Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment		0
Loans acquired with deteriorated credit quality		0
Collectively evaluated for impairment		785
Total		785
Acquired | Finance Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment		0
Loans acquired with deteriorated credit quality		0
Collectively evaluated for impairment		0
Total		$ 0