Securities - Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity (Details) $ in Thousands	Mar. 31, 2022 USD ($)
Amortized Cost
Less than one year	$ 95,878
Due after one year through five years	153,847
Due after five years through ten years	242,079
Due after ten years	297,723
Total amortized cost	789,527
Estimated Fair Value
Less than one year	95,857
Due after one year through five years	148,910
Due after five years through ten years	232,695
Due after ten years	289,589
Total estimated fair value	$ 767,051