Fair Value Disclosures of Financial Assets and Liabilities - Schedule of Financial Instruments Carried at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis:
Other assets	$ 5,153	$ 14,448
Liabilities measured at fair value on a recurring basis:
Other liabilities	23,291	32,257
Assets measured at fair value on a nonrecurring basis:
Total assets measured at fair value	5,210,464	2,543,505
Fair Value, Measurements, Nonrecurring
Assets measured at fair value on a nonrecurring basis:
Other real estate owned	2,320	3,061
Total assets measured at fair value	126,187	210,143
Quoted Prices in Active Markets for Identical Asset (Level 1) | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis:
Other assets	0	0
Liabilities measured at fair value on a recurring basis:
Other liabilities	0	0
Assets measured at fair value on a nonrecurring basis:
Total assets measured at fair value	0	0
Quoted Prices in Active Markets for Identical Asset (Level 1) | Fair Value, Measurements, Nonrecurring
Assets measured at fair value on a nonrecurring basis:
Other real estate owned	0	0
Total assets measured at fair value	0	0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis:
Other assets	5,153	14,448
Liabilities measured at fair value on a recurring basis:
Other liabilities	3,039	8,218
Assets measured at fair value on a nonrecurring basis:
Total assets measured at fair value	5,210,464	2,543,505
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring
Assets measured at fair value on a nonrecurring basis:
Other real estate owned	0	0
Total assets measured at fair value	113,349	197,541
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis:
Other assets	0	0
Liabilities measured at fair value on a recurring basis:
Other liabilities	20,252	24,039
Assets measured at fair value on a nonrecurring basis:
Total assets measured at fair value	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Assets measured at fair value on a nonrecurring basis:
Other real estate owned	2,320	3,061
Total assets measured at fair value	12,838	12,602
CMO | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis:
Investment securities, available for sale	575,766	471,325
CMO | Quoted Prices in Active Markets for Identical Asset (Level 1) | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis:
Investment securities, available for sale	0	0
CMO | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis:
Investment securities, available for sale	575,766	471,325
CMO | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis:
Investment securities, available for sale	0	0
FNMA MBS | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis:
Investment securities, available for sale	4,245,684	1,598,970
FNMA MBS | Quoted Prices in Active Markets for Identical Asset (Level 1) | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis:
Investment securities, available for sale	0	0
FNMA MBS | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis:
Investment securities, available for sale	4,245,684	1,598,970
FNMA MBS | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis:
Investment securities, available for sale	0	0
FHLMC MBS | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis:
Investment securities, available for sale	145,528	202,893
FHLMC MBS | Quoted Prices in Active Markets for Identical Asset (Level 1) | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis:
Investment securities, available for sale	0	0
FHLMC MBS | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis:
Investment securities, available for sale	145,528	202,893
FHLMC MBS | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis:
Investment securities, available for sale	0	0
GNMA MBS | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis:
Investment securities, available for sale	17,936	23,762
GNMA MBS | Quoted Prices in Active Markets for Identical Asset (Level 1) | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis:
Investment securities, available for sale	0	0
GNMA MBS | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis:
Investment securities, available for sale	17,936	23,762
GNMA MBS | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis:
Investment securities, available for sale	0	0
GSE agency notes | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis:
Investment securities, available for sale	220,397	232,107
GSE agency notes | Quoted Prices in Active Markets for Identical Asset (Level 1) | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis:
Investment securities, available for sale	0	0
GSE agency notes | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis:
Investment securities, available for sale	220,397	232,107
GSE agency notes | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis:
Investment securities, available for sale	0	0
Other investments | Fair Value, Measurements, Nonrecurring
Assets measured at fair value on a nonrecurring basis:
Other investments	10,518	9,541
Other investments | Quoted Prices in Active Markets for Identical Asset (Level 1) | Fair Value, Measurements, Nonrecurring
Assets measured at fair value on a nonrecurring basis:
Other investments	0	0
Other investments | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring
Assets measured at fair value on a nonrecurring basis:
Other investments	0	0
Other investments | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Assets measured at fair value on a nonrecurring basis:
Other investments	10,518	9,541
Loans held for sale | Fair Value, Measurements, Nonrecurring
Assets measured at fair value on a nonrecurring basis:
Loans held for sale	113,349	197,541
Loans held for sale | Quoted Prices in Active Markets for Identical Asset (Level 1) | Fair Value, Measurements, Nonrecurring
Assets measured at fair value on a nonrecurring basis:
Loans held for sale	0	0
Loans held for sale | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring
Assets measured at fair value on a nonrecurring basis:
Loans held for sale	113,349	197,541
Loans held for sale | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Assets measured at fair value on a nonrecurring basis:
Loans held for sale	$ 0	$ 0