Securities - Debt Securities Available-for-Sale in Unrealized Loss Position (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items]
Securities in unrealized loss position, less than 12 months, fair value	$ 370,488	$ 532,191
Securities in unrealized loss position, less than 12 months, unrealized losses	12,636	29,713
Securities in unrealized loss position, 12 months or more, fair value	751,706	457,065
Securities in unrealized loss position, 12 months or more, unrealized losses	115,858	92,028
Securities in unrealized loss position, total, fair value	1,122,194	989,256
Securities in unrealized loss position, total, unrealized losses	128,494	121,741
US government agencies
Debt Securities, Available-for-Sale [Line Items]
Securities in unrealized loss position, less than 12 months, fair value	23,832	15,668
Securities in unrealized loss position, less than 12 months, unrealized losses	246	412
Securities in unrealized loss position, 12 months or more, fair value	6,664	0
Securities in unrealized loss position, 12 months or more, unrealized losses	290	0
Securities in unrealized loss position, total, fair value	30,496	15,668
Securities in unrealized loss position, total, unrealized losses	536	412
Mortgage-backed securities
Debt Securities, Available-for-Sale [Line Items]
Securities in unrealized loss position, less than 12 months, fair value	346,178	513,639
Securities in unrealized loss position, less than 12 months, unrealized losses	12,368	29,060
Securities in unrealized loss position, 12 months or more, fair value	742,007	456,972
Securities in unrealized loss position, 12 months or more, unrealized losses	115,391	92,023
Securities in unrealized loss position, total, fair value	1,088,185	970,611
Securities in unrealized loss position, total, unrealized losses	127,759	121,083
Municipal bonds
Debt Securities, Available-for-Sale [Line Items]
Securities in unrealized loss position, less than 12 months, fair value	0	2,884
Securities in unrealized loss position, less than 12 months, unrealized losses	0	241
Securities in unrealized loss position, 12 months or more, fair value	3,035	93
Securities in unrealized loss position, 12 months or more, unrealized losses	177	5
Securities in unrealized loss position, total, fair value	3,035	2,977
Securities in unrealized loss position, total, unrealized losses	177	$ 246
Other debt securities
Debt Securities, Available-for-Sale [Line Items]
Securities in unrealized loss position, less than 12 months, fair value	478
Securities in unrealized loss position, less than 12 months, unrealized losses	22
Securities in unrealized loss position, 12 months or more, fair value	0
Securities in unrealized loss position, 12 months or more, unrealized losses	0
Securities in unrealized loss position, total, fair value	478
Securities in unrealized loss position, total, unrealized losses	$ 22