Loans and Leases - Acquired Loans and Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Sep. 29, 2017
Purchased Credit Impaired Loans (PCI)
Loans and leases acquired at fair value	$ 1,000,000	$ 771,300
Purchased credit impaired loans	0
Accretable Yield
Balance, beginning of period	1,051	0
Additions due to acquisition of loans	0	2,635
Accretion	(215)	(25)
Reclassifications from non-accretable difference	370	312
Payments received	(245)	(1,871)
Balance, end of period	961	1,051
Carrying Value
Balance, beginning of period	11,844	17
Additions due to acquisitions of loans	0	13,951
Accretion	215	25
Reclassifications on Purchase Credit Impaired Loans	(356)	0
Payments received	(7,886)	(2,149)
Balance, end of period	3,817	11,844
Leasing and equipment finance
Purchased Credit Impaired Loans (PCI)
Purchased credit impaired loans			$ 14,000
Contractually required payments receivable of purchased credit impaired loans			24,000
Expected cash flows of purchased credit impaired loans			16,600
Non-accretable difference			7,400
Initial accretable yield of purchased credit impaired loans			$ 2,600
Unpaid balance of purchased credit impaired loans	7,000	16,400
Carrying Value
Balance, beginning of period	11,844
Balance, end of period	$ 3,817	$ 11,844