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Securities Available for Sale - Summary of Securities Available for Sale (Details) - USD ($)	3 Months Ended		6 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2022	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,233,734,000		$ 2,233,734,000			$ 2,289,421,000
Gross Unrealized Gains	1,082,000		1,082,000			790,000
Gross Unrealized Losses	(318,230,000)		(318,230,000)			(318,082,000)
Fair Value	1,916,586,000		1,916,586,000			1,972,129,000
Amortized Cost	269,760,000		269,760,000			271,066,000
Gross Unrealized Gains	0		0			1,000
Gross Unrealized Losses	14,416,000		14,416,000			12,660,000
Fair Value	255,344,000		255,344,000			258,407,000
Accrued interest receivable for investment securities available for sale	8,500,000		8,500,000			7,800,000
Unrealized gains on securities available for sale net of taxes	(228,884,000)		(228,884,000)			(230,857,000)
Net gains on sales of securities available for sale	0	$ 0	0	$ 0
Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Unrealized gains on securities available for sale net of taxes	(223,000,000)		(223,000,000)			(223,100,000)
US Treasury Notes Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,994,000		3,994,000			3,990,000
Gross Unrealized Gains	0		0			0
Gross Unrealized Losses	(90,000)		(90,000)			(104,000)
Fair Value	3,904,000		3,904,000			3,886,000
Agency Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,000,000		4,000,000			4,000,000
Gross Unrealized Gains	0		0			0
Gross Unrealized Losses	(163,000)		(163,000)			(133,000)
Fair Value	3,837,000		3,837,000			3,867,000
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	904,848,000		904,848,000			947,541,000
Gross Unrealized Gains	0		0			0
Gross Unrealized Losses	(153,108,000)		(153,108,000)			(153,842,000)
Fair Value	751,740,000		751,740,000			793,699,000
Mortgage-backed securities: Residential
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	522,145,000		522,145,000			544,084,000
Gross Unrealized Gains	0		0			0
Gross Unrealized Losses	(86,997,000)		(86,997,000)			(90,907,000)
Fair Value	435,148,000		435,148,000			453,177,000
Amortized Cost	154,963,000		154,963,000			157,881,000
Gross Unrealized Gains	0		0			0
Gross Unrealized Losses	6,919,000		6,919,000			7,041,000
Fair Value	148,044,000		148,044,000			150,840,000
Mortgage-backed securities: Commercial
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	407,972,000		407,972,000			417,241,000
Gross Unrealized Gains	0		0			0
Gross Unrealized Losses	(55,121,000)		(55,121,000)			(48,954,000)
Fair Value	352,851,000		352,851,000			368,287,000
Amortized Cost	114,797,000		114,797,000			113,185,000
Gross Unrealized Gains	0		0			1,000
Gross Unrealized Losses	7,497,000		7,497,000			5,619,000
Fair Value	107,300,000		107,300,000			107,567,000
Asset-backed Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	153,536,000		153,536,000			153,539,000
Gross Unrealized Gains	0		0			0
Gross Unrealized Losses	(3,794,000)		(3,794,000)			(5,935,000)
Fair Value	149,742,000		149,742,000			147,604,000
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23,326,000		23,326,000			23,351,000
Gross Unrealized Gains	0		0			0
Gross Unrealized Losses	(4,754,000)		(4,754,000)			(4,494,000)
Fair Value	18,572,000		18,572,000			18,857,000
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	213,913,000		213,913,000			195,675,000
Gross Unrealized Gains	1,082,000		1,082,000			790,000
Gross Unrealized Losses	(14,203,000)		(14,203,000)			(13,713,000)
Fair Value	$ 200,792,000		$ 200,792,000			$ 182,752,000
Non-US Government and Agency Securities | Credit concentration risk | Stockholders' equity
Debt Securities, Available-for-sale [Line Items]
Maximum exposure to any single issuer			10.00%		10.00%

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