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Marketable Securities - Available For Sale (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Amortized cost    
Marketable securities available-for-sale, amortized cost $ 1,431,728 $ 1,565,002
Gross unrealized holding gains    
Residential mortgage-backed securities, gross unrealized holding gains 105 8,845
Gross unrealized holding losses    
Residential mortgage-backed securities, gross unrealized holding losses (213,725) (25,255)
Fair value    
Securities available-for-sale 1,218,108 1,548,592
U.S. government and agencies    
Amortized cost    
Due after one year through five years 20,000 20,000
Due after ten years 53,152 57,681
Gross unrealized holding gains    
Due after one year through five years 0 0
Due after ten years 0 0
Gross unrealized holding losses    
Due after one year through five years (1,799) (68)
Due after ten years (10,761) (1,722)
Fair value    
Due after one year through five years 18,201 19,932
Due after ten years 42,391 55,959
Government sponsored enterprises    
Amortized cost    
Due in less than one year   177
Due after one year through five years 993 991
Due after five years through ten years 45,814 46,411
Gross unrealized holding gains    
Due in less than one year   0
Due after one year through five years 0 73
Due after five years through ten years 0 1
Gross unrealized holding losses    
Due in less than one year   0
Due after one year through five years (49) 0
Due after five years through ten years (7,557) (1,568)
Fair value    
Due in less than one year   177
Due after one year through five years 944 1,064
Due after five years through ten years 38,257 44,844
Municipal securities    
Amortized cost    
Due in less than one year 506 946
Due after one year through five years 986 1,261
Due after five years through ten years 36,332 23,692
Due after ten years 89,631 99,558
Gross unrealized holding gains    
Due in less than one year 0 13
Due after one year through five years 21 22
Due after five years through ten years 0 661
Due after ten years 8 2,884
Gross unrealized holding losses    
Due in less than one year (1) 0
Due after one year through five years (13) (3)
Due after five years through ten years (2,290) (146)
Due after ten years (13,414) (187)
Fair value    
Due in less than one year 505 959
Due after one year through five years 994 1,280
Due after five years through ten years 34,042 24,207
Due after ten years 76,225 102,255
Money market funds    
Amortized cost    
Due after five years through ten years 13,540  
Gross unrealized holding gains    
Due after five years through ten years 0  
Gross unrealized holding losses    
Due after five years through ten years (562)  
Fair value    
Due after five years through ten years 12,978  
Residential mortgage-backed securities    
Amortized cost    
Due in less than one year 132  
Due after one year through five years 32,192  
Due after five years through ten years 46,188  
Due after ten years 1,092,262  
Marketable securities available-for-sale, amortized cost 1,170,774 1,314,285
Gross unrealized holding gains    
Residential mortgage-backed securities, gross unrealized holding gains 76 5,191
Gross unrealized holding losses    
Residential mortgage-backed securities, gross unrealized holding losses (177,279) (21,561)
Fair value    
Due in less than one year 130  
Due after one year through five years 29,538  
Due after five years through ten years 43,438  
Due after ten years 920,465  
Securities available-for-sale 993,571 1,297,915
Residential mortgage-backed securities | Agency CMOs    
Amortized cost    
Marketable securities available-for-sale, amortized cost   39,695
Gross unrealized holding gains    
Residential mortgage-backed securities, gross unrealized holding gains   224
Gross unrealized holding losses    
Residential mortgage-backed securities, gross unrealized holding losses   (62)
Fair value    
Securities available-for-sale   39,857
Fixed rate | Pass-through    
Amortized cost    
Marketable securities available-for-sale, amortized cost 227,122 265,604
Gross unrealized holding gains    
Residential mortgage-backed securities, gross unrealized holding gains 35 2,389
Gross unrealized holding losses    
Residential mortgage-backed securities, gross unrealized holding losses (31,171) (2,525)
Fair value    
Securities available-for-sale 195,986 265,468
Fixed rate | Agency CMOs    
Amortized cost    
Marketable securities available-for-sale, amortized cost 906,962 997,680
Gross unrealized holding gains    
Residential mortgage-backed securities, gross unrealized holding gains 0 2,284
Gross unrealized holding losses    
Residential mortgage-backed securities, gross unrealized holding losses (145,284) (18,965)
Fair value    
Securities available-for-sale 761,678 980,999
Variable rate | Pass-through    
Amortized cost    
Marketable securities available-for-sale, amortized cost 8,837 11,306
Gross unrealized holding gains    
Residential mortgage-backed securities, gross unrealized holding gains 10 294
Gross unrealized holding losses    
Residential mortgage-backed securities, gross unrealized holding losses (184) (9)
Fair value    
Securities available-for-sale 8,663 $ 11,591
Variable rate | Agency CMOs    
Amortized cost    
Marketable securities available-for-sale, amortized cost 27,853  
Gross unrealized holding gains    
Residential mortgage-backed securities, gross unrealized holding gains 31  
Gross unrealized holding losses    
Residential mortgage-backed securities, gross unrealized holding losses (640)  
Fair value    
Securities available-for-sale $ 27,244