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Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Values (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Investment Holdings [Line Items]
Amortized cost	$ 1,424,969
Total investment securities available for sale	1,318,072	$ 1,331,443
Investment securities held to maturity, at amortized cost, net (fair value of $684,647 and $673,434, respectively)	760,163	766,396
Total investment securities	684,647	673,434
Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Amortized cost	1,424,969	1,460,033
Gross Unrealized Gains	265	205
Gross Unrealized Losses	(107,162)	(128,795)
Total investment securities available for sale	1,318,072	1,331,443
Investment securities held to maturity, at amortized cost, net (fair value of $684,647 and $673,434, respectively)	760,163	766,396
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	12	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(75,528)	(92,962)
Total investment securities	684,647	673,434
U.S. government and agency securities | Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Amortized cost	68,514	68,912
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(3,964)	(5,053)
Total investment securities available for sale	64,550	63,859
Investment securities held to maturity, at amortized cost, net (fair value of $684,647 and $673,434, respectively)	150,969	150,936
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(28,298)	(33,585)
Total investment securities	122,671	117,351
Municipal securities | Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Amortized cost	146,525	171,087
Gross Unrealized Gains	218	172
Gross Unrealized Losses	(14,246)	(18,233)
Total investment securities available for sale	132,497	153,026
Residential CMO and MBS | Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Amortized cost	481,380	479,473
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(47,668)	(55,087)
Total investment securities available for sale	433,712	424,386
Investment securities held to maturity, at amortized cost, net (fair value of $684,647 and $673,434, respectively)	285,337	290,318
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	12	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(12,315)	(17,440)
Total investment securities	273,034	272,878
Commercial CMO and MBS | Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Amortized cost	704,156	714,136
Gross Unrealized Gains	47	19
Gross Unrealized Losses	(40,706)	(49,734)
Total investment securities available for sale	663,497	664,421
Investment securities held to maturity, at amortized cost, net (fair value of $684,647 and $673,434, respectively)	323,857	325,142
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(34,915)	(41,937)
Total investment securities	288,942	283,205
Corporate obligations | Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Amortized cost	4,000	4,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(183)	(166)
Total investment securities available for sale	3,817	3,834
Other asset-backed securities | Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Amortized cost	20,394	22,425
Gross Unrealized Gains	0	14
Gross Unrealized Losses	(395)	(522)
Total investment securities available for sale	$ 19,999	$ 21,917

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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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