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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2018
Cash Transactions:
Interest paid	$ 38,362	$ 77,748
Income taxes paid, net	433	620
Operating lease payments	3,516	3,424
Noncash Transactions:
Loans charged-off to the allowance for credit losses	14,274	11,693
Loans foreclosed upon and transferred to other real estate owned	139	1,800
Available-for-sale securities transferred to held-to-maturity portfolio	0	873,613	$ 179,800
Right of use assets recognized during the period in exchange for lease obligations	$ 531	$ 716

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