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Certificates of Deposit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Maturities Of Certificates Of Deposit [Line Items]
Certificates of deposit less than $100,000	$ 246,875	$ 277,225
Certificates $100,000 to $250,000	295,672	345,241
Certificates $250,000 and over	63,038	67,513
Total	605,585	689,979
Maturity of certificates of deposit [Abstract]
2021	500,339
2022	38,300
2023	47,183
2024	9,488
2025	10,131
2026 and thereafter	144
Total	605,585	689,979
Interest expense on certificates of deposit of $100,000 or greater	5,327	$ 6,060	$ 3,038
Less than $100,000
Maturities Of Certificates Of Deposit [Line Items]
Total	246,875
Maturity of certificates of deposit [Abstract]
2021	205,853
2022	16,889
2023	14,064
2024	4,562
2025	5,363
2026 and thereafter	144
Total	246,875
$100,000 and Greater
Maturities Of Certificates Of Deposit [Line Items]
Total	358,710
Maturity of certificates of deposit [Abstract]
2021	294,486
2022	21,411
2023	33,119
2024	4,926
2025	4,768
2026 and thereafter	0
Total	$ 358,710

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Interest expense incurred on time deposits, including certificates of deposits, of $100,000 or more in domestic offices.

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Amount of time deposit maturing after fifth fiscal year following current fiscal year. Time deposit includes, but is not limited to, certificate of deposit. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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