Securities - Amortized cost and fair value (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Amortized cost and fair value of investments classified as available for sale
Amortized Cost	$ 1,308,034	$ 1,361,797
Unrealized Gains	4,828	3,127
Unrealized Losses	(126,755)	(168,934)
Fair Value	1,186,107	1,195,990
U.S. Government agencies
Amortized cost and fair value of investments classified as available for sale
Amortized Cost	87,559	90,649
Unrealized Gains	95	3
Unrealized Losses	(8,472)	(11,670)
Fair Value	79,182	78,982
Mortgage Backed Securities - residential
Amortized cost and fair value of investments classified as available for sale
Amortized Cost	596,918	630,556
Unrealized Gains	897	15
Unrealized Losses	(62,313)	(89,251)
Fair Value	535,502	541,320
Mortgage Backed Securities - commercial
Amortized cost and fair value of investments classified as available for sale
Amortized Cost	12,821	14,182
Unrealized Gains	2	2
Unrealized Losses	(313)	(523)
Fair Value	12,510	13,661
Collateralized mortgage obligations
Amortized cost and fair value of investments classified as available for sale
Amortized Cost	176,523	190,552
Unrealized Gains	74	29
Unrealized Losses	(22,736)	(27,555)
Fair Value	153,861	163,026
State and municipal obligations
Amortized cost and fair value of investments classified as available for sale
Amortized Cost	394,013	394,696
Unrealized Gains	834	171
Unrealized Losses	(29,211)	(34,539)
Fair Value	365,636	360,328
Municipal taxable
Amortized cost and fair value of investments classified as available for sale
Amortized Cost	40,200	41,162
Unrealized Gains	83	11
Unrealized Losses	(3,710)	(5,396)
Fair Value	36,573	35,777
Collateralized debt obligations
Amortized cost and fair value of investments classified as available for sale
Unrealized Gains	2,843	2,896
Fair Value	$ 2,843	$ 2,896