v3.26.1
Marketable Securities - Available for Sale (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Amortized cost    
Total marketable securities available-for-sale $ 1,972,165 $ 1,710,978
Gross unrealized holding gains    
Total marketable securities available-for-sale 4,446 9,703
Gross unrealized holding losses    
Total marketable securities available-for-sale (147,432) (134,299)
Fair value    
Total marketable securities available-for-sale 1,829,179 1,586,382
U.S. government and agencies    
Amortized cost    
Due after one year through five years   1,631
Due after ten years 39,877 41,673
Gross unrealized holding gains    
Due after one year through five years   11
Due after ten years 0 0
Gross unrealized holding losses    
Due after one year through five years   (13)
Due after ten years (7,237) (7,390)
Fair value    
Due after one year through five years   1,629
Due after ten years 32,640 34,283
Government-sponsored enterprises    
Amortized cost    
Due after one year through five years   1,040
Due after five years through ten years   996
Gross unrealized holding gains    
Due after one year through five years   6
Due after five years through ten years   7
Gross unrealized holding losses    
Due after one year through five years   (2)
Due after five years through ten years   0
Fair value    
Due after one year through five years   1,044
Due after five years through ten years   1,003
Municipal securities    
Amortized cost    
Due within one year 1,250 1,810
Due after one year through five years 5,605 10,876
Due after five years through ten years 20,303 25,111
Due after ten years 48,105 52,342
Gross unrealized holding gains    
Due within one year 1 9
Due after one year through five years 13 118
Due after five years through ten years 160 393
Due after ten years 182 342
Gross unrealized holding losses    
Due within one year 0 0
Due after one year through five years (22) (7)
Due after five years through ten years (1,333) (1,253)
Due after ten years (6,234) (6,473)
Fair value    
Due within one year 1,251 1,819
Due after one year through five years 5,596 10,987
Due after five years through ten years 19,130 24,251
Due after ten years 42,053 46,211
Corporate debt issues    
Amortized cost    
Due within one year   500
Due after one year through five years 16,405 4,716
Due after five years through ten years 76,798 46,436
Due after ten years 5,000 4,000
Gross unrealized holding gains    
Due within one year   0
Due after one year through five years 15 12
Due after five years through ten years 1,557 1,429
Due after ten years 25 27
Gross unrealized holding losses    
Due within one year   0
Due after one year through five years (107) (22)
Due after five years through ten years (635) (64)
Due after ten years 0 0
Fair value    
Due within one year   500
Due after one year through five years 16,313 4,706
Due after five years through ten years 77,720 47,801
Due after ten years 5,025 4,027
Mortgage-backed securities    
Amortized cost    
Due within one year 34  
Due after one year through five years 11,569  
Due after five years through ten years 21,975  
Due after ten years 1,725,244  
Total marketable securities available-for-sale 1,758,822 1,519,847
Gross unrealized holding gains    
Total marketable securities available-for-sale 2,493 7,349
Gross unrealized holding losses    
Total marketable securities available-for-sale (131,864) (119,075)
Fair value    
Due within one year 35  
Due after one year through five years 10,914  
Due after five years through ten years 21,866  
Due after ten years 1,596,636  
Total marketable securities available-for-sale 1,629,451 1,408,121
Fixed rate pass-through    
Amortized cost    
Total marketable securities available-for-sale 531,344 407,377
Gross unrealized holding gains    
Total marketable securities available-for-sale 1,762 4,008
Gross unrealized holding losses    
Total marketable securities available-for-sale (14,664) (10,685)
Fair value    
Total marketable securities available-for-sale 518,442 400,700
Variable rate pass-through    
Amortized cost    
Total marketable securities available-for-sale 364 3,015
Gross unrealized holding gains    
Total marketable securities available-for-sale 5 66
Gross unrealized holding losses    
Total marketable securities available-for-sale 0 (2)
Fair value    
Total marketable securities available-for-sale 369 3,079
Fixed rate agency CMOs    
Amortized cost    
Total marketable securities available-for-sale 1,192,715 1,063,820
Gross unrealized holding gains    
Total marketable securities available-for-sale 664 3,170
Gross unrealized holding losses    
Total marketable securities available-for-sale (117,190) (108,309)
Fair value    
Total marketable securities available-for-sale 1,076,189 958,681
Variable rate agency CMOs    
Amortized cost    
Total marketable securities available-for-sale 34,399 45,635
Gross unrealized holding gains    
Total marketable securities available-for-sale 62 105
Gross unrealized holding losses    
Total marketable securities available-for-sale (10) (79)
Fair value    
Total marketable securities available-for-sale $ 34,451 $ 45,661