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Securities Available for Sale - Summary of Securities Available for Sale (Details)	3 Months Ended		6 Months Ended
	Mar. 31, 2021 USD ($) security	Mar. 31, 2020 USD ($)	Jun. 30, 2020	Dec. 31, 2020 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,228,369,000			$ 2,239,433,000
Gross Unrealized Gains	28,368,000			48,041,000
Gross Unrealized Losses	(22,993,000)			(1,863,000)
Allowance For Investment Credit Losses	0			0
Fair Value	2,233,744,000			2,285,611,000
Net gains on sales of securities available for sale	0	$ 0
Proceeds from sale of securities available for sale	0	$ 0
Unrealized gains on securities available for sale net of taxes	$ 5,223,000			$ 32,753,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| security	98			33
Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Unrealized gains on securities available for sale net of taxes	$ 4,400,000			$ 33,200,000
Collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	901,735,000			990,679,000
Gross Unrealized Gains	9,424,000			11,482,000
Gross Unrealized Losses	(6,500,000)			(844,000)
Allowance For Investment Credit Losses	0			0
Fair Value	904,659,000			1,001,317,000
No single maturity date, fair value	904,659,000
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Allowance For Investment Credit Losses	0
Mortgage-backed securities: Residential
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	646,409,000			672,667,000
Gross Unrealized Gains	3,190,000			8,460,000
Gross Unrealized Losses	(11,771,000)			(114,000)
Allowance For Investment Credit Losses	0			0
Fair Value	$ 637,828,000			$ 681,013,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| security	44			8
No single maturity date, fair value	$ 637,828,000
Mortgage-backed securities: Commercial
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	527,528,000			$ 482,874,000
Gross Unrealized Gains	13,378,000			25,026,000
Gross Unrealized Losses	(3,118,000)			(21,000)
Allowance For Investment Credit Losses	0			0
Fair Value	$ 537,788,000			$ 507,879,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| security	13			1
No single maturity date, fair value	$ 537,788,000
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	14,435,000			$ 7,000,000
Gross Unrealized Gains	0			15,000
Gross Unrealized Losses	(1,230,000)			(881,000)
Allowance For Investment Credit Losses	0			0
Fair Value	$ 13,205,000			$ 6,134,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| security	4			1
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 103,481,000			$ 86,213,000
Gross Unrealized Gains	2,272,000			3,058,000
Gross Unrealized Losses	(338,000)			(3,000)
Allowance For Investment Credit Losses	0			0
Fair Value	$ 105,415,000			$ 89,268,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| security	10			1
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%
Asset-backed Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 34,781,000
Gross Unrealized Gains	104,000
Gross Unrealized Losses	(36,000)
Allowance For Investment Credit Losses	0
Fair Value	$ 34,849,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| security	1
No single maturity date, fair value	$ 34,849,000