Other Intangible Assets and Goodwill - Net Carrying Value of Core Deposit Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net Core Deposit Intangibles and Aggregate Amortization Expense
Net carrying value	$ 52,259	$ 55,509
Aggregate amortization expense	10,271	10,370	$ 8,485
Core Deposits Intangibles
Net Core Deposit Intangibles and Aggregate Amortization Expense
Gross carrying value	95,120	88,099	85,506
Accumulated amortization	(42,861)	(32,590)	(22,220)
Net carrying value	52,259	55,509	63,286
Aggregate amortization expense	10,271	$ 10,370	$ 8,485
Estimated Amortization Expense
2022	10,658
2023	9,731
2024	8,815
2025	7,611
2026	$ 6,561

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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