Borrowings - Summary of Information Pertaining to Borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Long Term And Short Term Debt [Line Items]
Short-term borrowings, Balance	$ 383,925	$ 488,383
Long-term borrowings, Balance	114,775	115,933
Total Borrowings, Balance	$ 498,700	$ 604,316
Short-term borrowings, Weighted Average Rate	2.13%	2.57%
Long-term borrowings, Weighted Average Rate	3.34%	3.79%
Total Borrowings, Weighted Average Rate	2.41%	2.80%
Securities sold under repurchase agreements
Long Term And Short Term Debt [Line Items]
Short-term borrowings, Balance	$ 13,925	$ 18,383
Short-term borrowings, Weighted Average Rate	0.74%	0.46%
Short-term borrowings
Long Term And Short Term Debt [Line Items]
Short-term borrowings, Balance	$ 370,000	$ 470,000
Short-term borrowings, Weighted Average Rate	2.18%	2.65%
Long-term borrowings
Long Term And Short Term Debt [Line Items]
Long-term borrowings, Balance	$ 69,156	$ 70,314
Long-term borrowings, Weighted Average Rate	2.53%	2.84%
Junior subordinated debt securities
Long Term And Short Term Debt [Line Items]
Long-term borrowings, Balance	$ 45,619	$ 45,619
Long-term borrowings, Weighted Average Rate	4.58%	5.25%