Goodwill and Other Intangible Assets - Estimated Amortization Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill and other intangibles assets
Intangible assets, gross	$ 132,203	$ 114,864
Accumulated amortization	74,152	62,879
Total estimated amortization expense	58,051	51,985
Amortization expense	11,274	10,008	$ 9,547
Estimated amortization expense:
2022	11,628
2023	10,432
2024	9,220
2025	7,843
2026	6,706
Thereafter	12,222
Total estimated amortization expense	58,051	51,985
Core deposit intangible assets
Goodwill and other intangibles assets
Intangible assets, gross	99,065	90,256
Accumulated amortization	55,161	46,909
Total estimated amortization expense	43,904	43,347
Amortization expense	8,253	7,753
Estimated amortization expense:
2022	8,315
2023	7,616
2024	6,902
2025	5,956
2026	5,227
Thereafter	9,888
Total estimated amortization expense	43,904	43,347
Customer relationship intangible assets
Goodwill and other intangibles assets
Intangible assets, gross	33,138	24,608
Accumulated amortization	18,991	15,970
Total estimated amortization expense	14,147	8,638
Amortization expense	3,021	2,255
Estimated amortization expense:
2022	3,313
2023	2,816
2024	2,318
2025	1,887
2026	1,479
Thereafter	2,334
Total estimated amortization expense	$ 14,147	$ 8,638