Loans Receivable, Net - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment and Based on Impairment Method Excluding PCI Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Allowance for credit losses on loans
Balance at beginning of period	$ 50,598	$ 59,976	$ 48,850	$ 60,735
Credit loss (benefit) expense	1,472	(5,876)	3,128	(6,915)
Charge-offs	(287)	(420)	(430)	(776)
Recoveries	278	196	513	832
Balance at end of period	52,061	53,876	52,061	53,876
Commercial Real Estate – Investor
Allowance for credit losses on loans
Balance at beginning of period	23,637	36,922	25,504	26,703
Credit loss (benefit) expense	(1,080)	(3,583)	(2,947)	6,566
Charge-offs	0	(311)	0	(345)
Recoveries	51	9	51	113
Balance at end of period	22,608	33,037	22,608	33,037
Commercial real estate – owner occupied
Allowance for credit losses on loans
Balance at beginning of period	5,053	7,827	5,884	15,054
Credit loss (benefit) expense	(116)	(1,483)	(956)	(8,740)
Charge-offs	(14)	0	(18)	0
Recoveries	98	6	111	36
Balance at end of period	5,021	6,350	5,021	6,350
Commercial and industrial
Allowance for credit losses on loans
Balance at beginning of period	4,649	2,541	5,039	5,390
Credit loss (benefit) expense	572	1,871	166	(1,004)
Charge-offs	0	(33)	0	(33)
Recoveries	19	25	35	51
Balance at end of period	5,240	4,404	5,240	4,404
Residential Real Estate
Allowance for credit losses on loans
Balance at beginning of period	16,277	11,280	11,155	11,818
Credit loss (benefit) expense	1,966	(2,462)	6,994	(2,797)
Charge-offs	(56)	0	(56)	(242)
Recoveries	9	0	103	39
Balance at end of period	18,196	8,818	18,196	8,818
Other consumer
Allowance for credit losses on loans
Balance at beginning of period	982	1,406	1,268	1,770
Credit loss (benefit) expense	130	(219)	(129)	(940)
Charge-offs	(217)	(76)	(356)	(156)
Recoveries	101	156	213	593
Balance at end of period	$ 996	$ 1,267	$ 996	$ 1,267