Statements of Cash Flows - Cash Flows Supplementary Disclosures (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Statement of cash flows specific transaction amounts [Abstract]
Income taxes paid	$ 13,045	$ 23,309
Interest expense paid on deposits and borrowings	13,815	26,808
Noncash transfers from loans to other real estate	382	406
Finance right-of-use assets resulting from lease liabilities	92
Operating right-of-use assets resulting from lease liabilities	$ 4,278	$ 671