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Securities (Tables)
 3 Months Ended
Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of Debt Securities, Available-for-sale
The amortized cost, estimated fair value, and allowance for securities credit losses of debt securities available-for-sale and held-to-maturity at March 31, 2021 and December 31, 2020 are as follows (in thousands):
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value		Allowance for Credit Losses
At March 31, 2021
Debt securities available-for-sale:
U.S. government and agency obligations$169,337 $2,570 $(8)$171,899 $— 
Collateralized loan obligations (“CLOs”)96,410 96 (40)96,466 — 
Mortgage-backed securities - FNMA144 2 — 146 — 
Total debt securities available-for-sale$265,891 $2,668 $(48)$268,511 $— 
Debt securities held-to-maturity:
State, municipal and sovereign debt obligations278,179 7,043 (1,106)284,116 (90)
Corporate debt securities72,821 1,542 (1,912)72,451 (1,511)
Mortgage-backed securities:
FHLMC303,539 4,256 (3,178)304,617 — 
FNMA335,307 5,978 (2,481)338,804 — 
GNMA59,904 1,614 (23)61,495 — 
SBA5,190 — (58)5,132 — 
Other32,269 861 — 33,130 (116)
Total mortgage-backed securities736,209 12,709 (5,740)743,178 (116)
Total debt securities held-to-maturity$1,087,209 $21,294 $(8,758)$1,099,745 $(1,717)
Total debt securities$1,353,100 $23,962 $(8,806)$1,368,256 $(1,717)
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value		Allowance for Credit Losses
At December 31, 2020
Debt securities available-for-sale:
U.S. government and agency obligations$173,790 $3,152 $(2)$176,940 $— 
CLOs6,174 — (4)6,170 — 
Mortgage-backed securities - FNMA190 2 — 192 — 
Total debt securities available-for-sale$180,154 $3,154 $(6)$183,302 $— 
Debt securities held-to-maturity:
State and municipal obligations238,405 11,500 (231)249,674 (48)
Corporate debt securities72,305 1,615 (2,652)71,268 (1,550)
Mortgage-backed securities:
FHLMC232,942 5,383 (124)238,201 
FNMA293,615 7,640 (147)301,108 
GNMA67,334 2,014 (12)69,336 
SBA5,392 — (60)5,332 
Other32,321 1,226 — 33,547 (117)
Total mortgage-backed securities631,604 16,263 (343)647,524 (117)
Total debt securities held-to-maturity$942,314 $29,378 $(3,226)$968,466 $(1,715)
Total debt securities$1,122,468 $32,532 $(3,232)$1,151,768 $(1,715)
Schedule of Debt Securities, Held-to-maturity, Allowance for Credit Loss
The following table presents the activity in the allowance for credit losses for debt securities held-to-maturity for the three months ended March 31, 2021 and March 31, 2020 (in thousands):
Three Months Ended March 31,
20212020
Allowance for credit losses
Beginning balance$(1,715)$— 
Impact of CECL adoption— (1,268)
Provision for credit loss expense(2)(1,261)
Total ending allowance balance$(1,717)$(2,529)
Schedule of Carrying Value of Held-to-Maturity Investment Securities The carrying value of the debt securities held-to-maturity at March 31, 2021 and December 31, 2020 is as follows (in thousands): 
March 31, 2021December 31, 2020
Amortized cost$1,087,209 $942,314 
Net loss on date of transfer from available-for-sale(13,347)(13,347)
Allowance for securities credit loss(1,717)(1,715)
Accretion of net unrealized loss on securities reclassified as held-to-maturity10,181 10,001 
Carrying value$1,082,326 $937,253 
The realized and unrealized gains or losses on equity securities for the three months ended March 31, 2021 and March 31, 2020 are shown in the table below (in thousands):
Three Months Ended March 31,
20212020
Net gain on equity investments$8,287 $155 
Less: Net gains recognized on equity securities sold8,123 — 
Unrealized gain recognized on equity securities still held$164 $155 
Schedule of Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity
The amortized cost and estimated fair value of debt securities at March 31, 2021 by contractual maturity are shown below (in thousands). Actual maturities may differ from contractual maturities in instances where issuers have the right to call or prepay obligations with or without call or prepayment penalties. At March 31, 2021, corporate debt securities with an amortized cost of $54.3 million, and estimated fair value of $54.0 million, and CLOs with an amortized cost of $96.4 million, and estimated fair value of $96.5 million, were callable prior to the maturity date.
 
March 31, 2021Amortized
Cost		Estimated
Fair Value
Less than one year$105,213 $105,784 
Due after one year through five years189,783 194,363 
Due after five years through ten years164,010 162,249 
Due after ten years157,741 162,536 
$616,747 $624,932 
Summary of Estimated Fair Value and Unrealized Loss for Securities Available-for-Sale and Held-to-Maturity
The estimated fair value and unrealized losses for debt securities available-for-sale and held-to-maturity at March 31, 2021 and December 31, 2020, segregated by the duration of the unrealized losses, are as follows (in thousands):
 At March 31, 2021
 Less than 12 months12 months or longerTotal
 Estimated
Fair
Value		Unrealized
Losses		Estimated
Fair
Value		Unrealized
Losses		Estimated
Fair
Value		Unrealized
Losses
Debt securities available-for-sale:
U.S. government and agency obligations$10,139 $(8)$— $— $10,139 $(8)
CLOs47,053 (40)— — 47,053 (40)
Total debt securities available-for-sale57,192 (48)— — 57,192 (48)
Debt securities held-to-maturity:
State, municipal and sovereign debt obligations$50,696 $(890)$5,748 $(216)$56,444 $(1,106)
Corporate debt securities39,041 (1,774)3,818 (138)42,859 (1,912)
Mortgage-backed securities:
FHLMC158,632 (3,178)— — 158,632 (3,178)
FNMA163,103 (2,478)293 (3)163,396 (2,481)
GNMA6,104 (23)— — 6,104 (23)
SBA2,015 (48)3,116 (10)5,131 (58)
Total mortgage-backed securities329,854 (5,727)3,409 (13)333,263 (5,740)
Total debt securities held-to-maturity419,591 (8,391)12,975 (367)432,566 (8,758)
Total debt securities$476,783 $(8,439)$12,975 $(367)$489,758 $(8,806)
 At December 31, 2020
 Less than 12 months12 months or longerTotal
 Estimated
Fair
Value		Unrealized
Losses		Estimated
Fair
Value		Unrealized
Losses		Estimated
Fair
Value		Unrealized
Losses
Debt securities available-for-sale:
U.S. government and agency obligations$17,029 $(2)$— $— $17,029 $(2)
CLOs4,766 (4)— — 4,766 (4)
Total debt securities available-for-sale21,795 (6)— — 21,795 (6)
Debt securities held-to-maturity:
State and municipal obligations2,823 (23)7,509 (208)10,332 (231)
Corporate debt securities10,192 (255)35,935 (2,397)46,127 (2,652)
Mortgage-backed securities:
FHLMC24,661 (117)669 (7)25,330 (124)
FNMA39,365 (128)939 (19)40,304 (147)
GNMA5,856 (11)207 (1)6,063 (12)
SBA3,626 (12)1,706 (48)5,332 (60)
Total mortgage-backed securities73,508 (268)3,521 (75)77,029 (343)
Total debt securities held-to-maturity86,523 (546)46,965 (2,680)133,488 (3,226)
Total debt securities$108,318 $(552)$46,965 $(2,680)$155,283 $(3,232)
Schedule of Debt Securities, Held-to-maturity, Credit Quality Indicator The following table summarized the amortized cost of debt securities held-to-maturity at March 31, 2021, aggregated by credit quality indicator (in thousands):
AAAAAABBBBBTotal
As of March 31, 2021
State, municipal and sovereign debt obligations$33,421 $138,734 $72,959 $33,065 $— $278,179 
Corporate debt securities— 497 11,995 48,995 11,334 72,821 
Mortgage-backed securities - Other11,111 21,158 — — — 32,269 
Total debt securities held-to-maturity$44,532 $160,389 $84,954 $82,060 $11,334 $383,269