Fair Value Measurements - Fair Value Hierarchy (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Investment securities:
Loans held for sale	$ 4,600	$ 5,300
Recurring
Investment securities:
Loans held for sale	4,597	5,324
Total assets	2,373,929	2,369,011
Recurring | Corporate bonds
Investment securities:
Available-for-sale securities	9,343	9,346
Recurring | Agency bond securities
Investment securities:
Available-for-sale securities	196,689	193,106
Recurring | Agency mortgage-backed securities
Investment securities:
Available-for-sale securities	2,139,439	2,138,262
Recurring | Municipal bonds
Investment securities:
Available-for-sale securities	23,861	22,973
Recurring | Level 1
Investment securities:
Loans held for sale	0	0
Total assets	0	0
Recurring | Level 1 | Corporate bonds
Investment securities:
Available-for-sale securities	0	0
Recurring | Level 1 | Agency bond securities
Investment securities:
Available-for-sale securities	0	0
Recurring | Level 1 | Agency mortgage-backed securities
Investment securities:
Available-for-sale securities	0	0
Recurring | Level 1 | Municipal bonds
Investment securities:
Available-for-sale securities	0	0
Recurring | Level 2
Investment securities:
Loans held for sale	0	0
Total assets	2,369,332	2,363,687
Recurring | Level 2 | Corporate bonds
Investment securities:
Available-for-sale securities	9,343	9,346
Recurring | Level 2 | Agency bond securities
Investment securities:
Available-for-sale securities	196,689	193,106
Recurring | Level 2 | Agency mortgage-backed securities
Investment securities:
Available-for-sale securities	2,139,439	2,138,262
Recurring | Level 2 | Municipal bonds
Investment securities:
Available-for-sale securities	23,861	22,973
Recurring | Level 3
Investment securities:
Loans held for sale	4,597	5,324
Total assets	4,597	5,324
Recurring | Level 3 | Corporate bonds
Investment securities:
Available-for-sale securities	0	0
Recurring | Level 3 | Agency bond securities
Investment securities:
Available-for-sale securities	0	0
Recurring | Level 3 | Agency mortgage-backed securities
Investment securities:
Available-for-sale securities	0	0
Recurring | Level 3 | Municipal bonds
Investment securities:
Available-for-sale securities	$ 0	$ 0