Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Values (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Investment Holdings [Line Items]
Amortized Cost	$ 1,402,144	$ 1,460,033
Gross Unrealized Gains	74	205
Gross Unrealized Losses	(125,668)	(128,795)
Debt Securities, Available-for-Sale, Excluding Accrued Interest	1,276,550	1,331,443
Investment securities held to maturity, at amortized cost, net (fair value of $664,810 and $673,434, respectively)	754,276	766,396
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(89,466)
Total investment securities	664,810	673,434
Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Investment securities held to maturity, at amortized cost, net (fair value of $664,810 and $673,434, respectively)		766,396
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain		0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss		(92,962)
Total investment securities		673,434
U.S. government and agency securities
Investment Holdings [Line Items]
Amortized Cost	68,514	68,912
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(4,255)	(5,053)
Debt Securities, Available-for-Sale, Excluding Accrued Interest	64,259	63,859
Investment securities held to maturity, at amortized cost, net (fair value of $664,810 and $673,434, respectively)	151,005
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(30,245)
Total investment securities	120,760
U.S. government and agency securities \| Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Investment securities held to maturity, at amortized cost, net (fair value of $664,810 and $673,434, respectively)		150,936
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain		0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss		(33,585)
Total investment securities		117,351
Municipal securities
Investment Holdings [Line Items]
Amortized Cost	145,681	171,087
Gross Unrealized Gains	48	172
Gross Unrealized Losses	(15,714)	(18,233)
Debt Securities, Available-for-Sale, Excluding Accrued Interest	130,015	153,026
Residential CMO and MBS(1)
Investment Holdings [Line Items]
Amortized Cost	465,625	479,473
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(54,653)	(55,087)
Debt Securities, Available-for-Sale, Excluding Accrued Interest	410,972	424,386
Investment securities held to maturity, at amortized cost, net (fair value of $664,810 and $673,434, respectively)	280,032
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(17,219)
Total investment securities	262,813
Residential CMO and MBS(1) \| Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Investment securities held to maturity, at amortized cost, net (fair value of $664,810 and $673,434, respectively)		290,318
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain		0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss		(17,440)
Total investment securities		272,878
Commercial CMO and MBS(1)
Investment Holdings [Line Items]
Amortized Cost	698,833	714,136
Gross Unrealized Gains	17	19
Gross Unrealized Losses	(50,509)	(49,734)
Debt Securities, Available-for-Sale, Excluding Accrued Interest	648,341	664,421
Investment securities held to maturity, at amortized cost, net (fair value of $664,810 and $673,434, respectively)	323,239
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(42,002)
Total investment securities	281,237
Commercial CMO and MBS(1) \| Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Investment securities held to maturity, at amortized cost, net (fair value of $664,810 and $673,434, respectively)		325,142
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain		0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss		(41,937)
Total investment securities		283,205
Corporate obligations
Investment Holdings [Line Items]
Amortized Cost	4,000	4,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(226)	(166)
Debt Securities, Available-for-Sale, Excluding Accrued Interest	3,774	3,834
Other asset-backed securities
Investment Holdings [Line Items]
Amortized Cost	19,491	22,425
Gross Unrealized Gains	9	14
Gross Unrealized Losses	(311)	(522)
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 19,189	$ 21,917

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost excluding accrued interest, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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