Borrowings - Summary of Information Pertaining to Borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Long Term And Short Term Debt [Line Items]
Short-term borrowings, Balance	$ 125,706	$ 301,207
Long-term borrowings, Balance	113,144	115,145
Total Borrowings, Balance	$ 238,850	$ 416,352
Short-term borrowings, Weighted Average Rate	0.32%	1.76%
Long-term borrowings, Weighted Average Rate	2.79%	3.15%
Total Borrowings, Weighted Average Rate	1.49%	2.14%
Securities sold under repurchase agreements
Long Term And Short Term Debt [Line Items]
Short-term borrowings, Balance	$ 42,706	$ 19,888
Short-term borrowings, Weighted Average Rate	0.25%	0.74%
Short-term borrowings
Long Term And Short Term Debt [Line Items]
Short-term borrowings, Balance	$ 83,000	$ 281,319
Short-term borrowings, Weighted Average Rate	0.36%	1.84%
Long-term borrowings
Long Term And Short Term Debt [Line Items]
Long-term borrowings, Balance	$ 49,076	$ 50,868
Long-term borrowings, Weighted Average Rate	2.47%	2.60%
Junior subordinated debt securities
Long Term And Short Term Debt [Line Items]
Long-term borrowings, Balance	$ 64,068	$ 64,277
Long-term borrowings, Weighted Average Rate	3.03%	3.59%