Note 3 - Investment Securities - Gross Unrealized Losses, Investment Securities Portfolio (Details) $ in Thousands |
Jun. 30, 2025
USD ($)
|
Dec. 31, 2024
USD ($)
|
Available for sale securities, less than 12 months, number of investment positions |
28
|
22
|
Held to Maturity securities, less than 12 months, number of investment positions |
21
|
47
|
Available for sale securities, less than 12 months, fair value |
$ 149,425
|
$ 66,670
|
Held to Maturity securities, less than 12 months, fair value |
59,597
|
267,612
|
Available for sale securities, less than 12 months, unrealized loss |
(822)
|
(692)
|
Held to Maturity securities, less than 12 months, unrealized loss |
$ (242)
|
$ (4,308)
|
Available for sale securities, 12 months or longer, number of investment positions |
314
|
332
|
Held to Maturity securities, 12 months or longer, number of investment positions |
127
|
141
|
Available for sale securities, 12 months or longer, fair value |
$ 2,491,049
|
$ 2,653,765
|
Held to Maturity securities, 12 months or longer, fair value |
521,651
|
530,005
|
Available for sale securities, 12 months or longer, unrealized loss |
(165,711)
|
(238,759)
|
Held to Maturity securities, 12 months or longer, unrealized loss |
$ (17,672)
|
$ (32,524)
|
Available for sale securities, total, number of investment positions |
342
|
354
|
Held to Maturity securities, total, number of investment positions |
148
|
188
|
Available for sale securities, total, fair value |
$ 2,640,474
|
$ 2,720,435
|
Held to Maturity securities, total, fair value |
581,248
|
797,617
|
Available for sale securities, total, unrealized loss |
(166,533)
|
(239,451)
|
Held to Maturity securities, total, unrealized loss |
$ (17,914)
|
$ (36,832)
|
Agency Residential MBS [Member] |
|
|
Available for sale securities, less than 12 months, number of investment positions |
9
|
12
|
Held to Maturity securities, less than 12 months, number of investment positions |
0
|
0
|
Available for sale securities, less than 12 months, fair value |
$ 17,873
|
$ 18,030
|
Held to Maturity securities, less than 12 months, fair value |
0
|
0
|
Available for sale securities, less than 12 months, unrealized loss |
(549)
|
(471)
|
Held to Maturity securities, less than 12 months, unrealized loss |
$ 0
|
$ 0
|
Available for sale securities, 12 months or longer, number of investment positions |
102
|
103
|
Held to Maturity securities, 12 months or longer, number of investment positions |
69
|
80
|
Available for sale securities, 12 months or longer, fair value |
$ 177,288
|
$ 192,963
|
Held to Maturity securities, 12 months or longer, fair value |
46,038
|
52,771
|
Available for sale securities, 12 months or longer, unrealized loss |
(12,372)
|
(17,520)
|
Held to Maturity securities, 12 months or longer, unrealized loss |
$ (2,887)
|
$ (4,218)
|
Available for sale securities, total, number of investment positions |
111
|
115
|
Held to Maturity securities, total, number of investment positions |
69
|
80
|
Available for sale securities, total, fair value |
$ 195,161
|
$ 210,993
|
Held to Maturity securities, total, fair value |
46,038
|
52,771
|
Available for sale securities, total, unrealized loss |
(12,921)
|
(17,991)
|
Held to Maturity securities, total, unrealized loss |
$ (2,887)
|
$ (4,218)
|
US States and Political Subdivisions Debt Securities [Member] |
|
|
Available for sale securities, less than 12 months, number of investment positions |
4
|
2
|
Held to Maturity securities, less than 12 months, number of investment positions |
11
|
24
|
Available for sale securities, less than 12 months, fair value |
$ 4,649
|
$ 2,764
|
Held to Maturity securities, less than 12 months, fair value |
8,534
|
15,822
|
Available for sale securities, less than 12 months, unrealized loss |
(15)
|
(21)
|
Held to Maturity securities, less than 12 months, unrealized loss |
$ (8)
|
$ (78)
|
Available for sale securities, 12 months or longer, number of investment positions |
39
|
40
|
Held to Maturity securities, 12 months or longer, number of investment positions |
24
|
26
|
Available for sale securities, 12 months or longer, fair value |
$ 49,443
|
$ 51,759
|
Held to Maturity securities, 12 months or longer, fair value |
22,673
|
25,814
|
Available for sale securities, 12 months or longer, unrealized loss |
(1,145)
|
(1,680)
|
Held to Maturity securities, 12 months or longer, unrealized loss |
$ (123)
|
$ (299)
|
Available for sale securities, total, number of investment positions |
43
|
42
|
Held to Maturity securities, total, number of investment positions |
35
|
50
|
Available for sale securities, total, fair value |
$ 54,092
|
$ 54,523
|
Held to Maturity securities, total, fair value |
31,207
|
41,636
|
Available for sale securities, total, unrealized loss |
(1,160)
|
(1,701)
|
Held to Maturity securities, total, unrealized loss |
$ (131)
|
$ (377)
|
Agency Commercial MBS [Member] |
|
|
Available for sale securities, less than 12 months, number of investment positions |
6
|
2
|
Available for sale securities, less than 12 months, fair value |
$ 26,624
|
$ 6,966
|
Available for sale securities, less than 12 months, unrealized loss |
$ (65)
|
$ (132)
|
Available for sale securities, 12 months or longer, number of investment positions |
0
|
0
|
Available for sale securities, 12 months or longer, fair value |
$ 0
|
$ 0
|
Available for sale securities, 12 months or longer, unrealized loss |
$ 0
|
$ 0
|
Available for sale securities, total, number of investment positions |
6
|
2
|
Available for sale securities, total, fair value |
$ 26,624
|
$ 6,966
|
Available for sale securities, total, unrealized loss |
$ (65)
|
$ (132)
|
Corporate Debt Securities [Member] |
|
|
Available for sale securities, less than 12 months, number of investment positions |
0
|
0
|
Held to Maturity securities, less than 12 months, number of investment positions |
10
|
23
|
Available for sale securities, less than 12 months, fair value |
$ 0
|
$ 0
|
Held to Maturity securities, less than 12 months, fair value |
51,063
|
251,790
|
Available for sale securities, less than 12 months, unrealized loss |
0
|
0
|
Held to Maturity securities, less than 12 months, unrealized loss |
$ (234)
|
$ (4,230)
|
Available for sale securities, 12 months or longer, number of investment positions |
132
|
138
|
Held to Maturity securities, 12 months or longer, number of investment positions |
34
|
35
|
Available for sale securities, 12 months or longer, fair value |
$ 1,792,021
|
$ 1,824,327
|
Held to Maturity securities, 12 months or longer, fair value |
452,940
|
451,420
|
Available for sale securities, 12 months or longer, unrealized loss |
(139,558)
|
(195,334)
|
Held to Maturity securities, 12 months or longer, unrealized loss |
$ (14,662)
|
$ (28,007)
|
Available for sale securities, total, number of investment positions |
132
|
138
|
Held to Maturity securities, total, number of investment positions |
44
|
58
|
Available for sale securities, total, fair value |
$ 1,792,021
|
$ 1,824,327
|
Held to Maturity securities, total, fair value |
504,003
|
703,210
|
Available for sale securities, total, unrealized loss |
(139,558)
|
(195,334)
|
Held to Maturity securities, total, unrealized loss |
$ (14,896)
|
$ (32,237)
|
US Government Agencies Debt Securities [Member] |
|
|
Available for sale securities, less than 12 months, number of investment positions |
2
|
3
|
Available for sale securities, less than 12 months, fair value |
$ 6,512
|
$ 12,085
|
Available for sale securities, less than 12 months, unrealized loss |
$ (2)
|
$ (53)
|
Available for sale securities, 12 months or longer, number of investment positions |
19
|
19
|
Available for sale securities, 12 months or longer, fair value |
$ 285,159
|
$ 275,467
|
Available for sale securities, 12 months or longer, unrealized loss |
$ (10,539)
|
$ (19,032)
|
Available for sale securities, total, number of investment positions |
21
|
22
|
Available for sale securities, total, fair value |
$ 291,671
|
$ 287,552
|
Available for sale securities, total, unrealized loss |
$ (10,541)
|
$ (19,085)
|
Collateralized Debt Obligations [Member] |
|
|
Available for sale securities, less than 12 months, number of investment positions |
7
|
3
|
Available for sale securities, less than 12 months, fair value |
$ 93,767
|
$ 26,825
|
Available for sale securities, less than 12 months, unrealized loss |
$ (191)
|
$ (15)
|
Available for sale securities, 12 months or longer, number of investment positions |
22
|
32
|
Available for sale securities, 12 months or longer, fair value |
$ 187,138
|
$ 309,249
|
Available for sale securities, 12 months or longer, unrealized loss |
$ (2,097)
|
$ (5,193)
|
Available for sale securities, total, number of investment positions |
29
|
35
|
Available for sale securities, total, fair value |
$ 280,905
|
$ 336,074
|
Available for sale securities, total, unrealized loss |
$ (2,288)
|
$ (5,208)
|